It covers- Introduction to R language, Creating, Exploring data with Various Data Structures e.g. Vector, Array, Matrices, and Factors. Using Methods with examples.
In this tutorial, we learn to create variables in R. Followed by that, we explore the different data types including numeric, integer, character, logical and date/time.
Learn the basics of data visualization in R. In this module, we explore the Graphics package and learn to build basic plots in R. In addition, learn to add title, axis labels and range. Modify the color, font and font size. Add text annotations and combine multiple plots. Finally, learn how to save the plots in different formats.
This hands-on R course will guide users through a variety of programming functions in the open-source statistical software program, R. Topics covered include indexing, loops, conditional branching, S3 classes, and debugging. Full workshop materials available from http://projects.iq.harvard.edu/rtc/r-prog
Learn the built-in mathematical functions in R. This tutorial is part of the Working With Data module of the R Programming course offered by r-squared.
It covers- Introduction to R language, Creating, Exploring data with Various Data Structures e.g. Vector, Array, Matrices, and Factors. Using Methods with examples.
In this tutorial, we learn to create variables in R. Followed by that, we explore the different data types including numeric, integer, character, logical and date/time.
Learn the basics of data visualization in R. In this module, we explore the Graphics package and learn to build basic plots in R. In addition, learn to add title, axis labels and range. Modify the color, font and font size. Add text annotations and combine multiple plots. Finally, learn how to save the plots in different formats.
This hands-on R course will guide users through a variety of programming functions in the open-source statistical software program, R. Topics covered include indexing, loops, conditional branching, S3 classes, and debugging. Full workshop materials available from http://projects.iq.harvard.edu/rtc/r-prog
Learn the built-in mathematical functions in R. This tutorial is part of the Working With Data module of the R Programming course offered by r-squared.
This presentation educated you about R - Factors with example syntax and demo program of Factors in Data Frame, Changing the Order of Levels and Generating Factor Levels.
For more topics stay tuned with Learnbay.
'Business Analytics with 'R' at Edureka will prepare you to perform analytics and build models for real world data science problems. It is the world’s most powerful programming language for statistical computing and graphics making it a must know language for the aspiring Data Scientists. 'R' wins strongly on Statistical Capability, Graphical capability, Cost and rich set of packages.
Overview and about R, R Studio Installation, Fundamentals of R Programming: Data Structures and Data Types, Operators, Control Statements, Loop Statements, Functions,
Descriptive Analysis using R: Maximum, Minimum, Range, Mean, Median and Mode, Variance, Standard Deviation, Quantiles, IQR, Summary
The R language is a project designed to create a free, open source language which can be used as a replacement for the S-PLUS language, originally developed as the S language at AT&T Bell Labs, and currently marketed by Insightful Corporation of Seattle, Washington. R is an open source implementation of S, and differs from S-plus largely in its command-line only format.
Topics Covered:
1.Introduction to R
2.Installing R
3.Why Learn R
4.The R Console
5.Basic Arithmetic and Objects
6.Program Example
7.Programming with Big Data in R
8.Big Data Strategies in R
9.Applications of R Programming
10.Companies Using R
11.What R is not so good at
12.Conclusion
This presentation educates you about R - data types in detail with data type syntax, the data types are - Vectors, Lists, Matrices, Arrays, Factors, Data Frames.
For more topics stay tuned with Learnbay.
Dynamic Programming is a method for solving a complex problem by breaking it down into a collection of simpler subproblems, solving each of those subproblems just once, and storing their solutions using a memory-based data structure (array, map,etc).
As part of the GSP’s capacity development and improvement programme, FAO/GSP have organised a one week training in Izmir, Turkey. The main goal of the training was to increase the capacity of Turkey on digital soil mapping, new approaches on data collection, data processing and modelling of soil organic carbon. This 5 day training is titled ‘’Training on Digital Soil Organic Carbon Mapping’’ was held in IARTC - International Agricultural Research and Education Center in Menemen, Izmir on 20-25 August, 2017.
In DBMS (DataBase Management System), the relation algebra is important term to further understand the queries in SQL (Structured Query Language) database system. In it just give up the overview of operators in DBMS two of one method relational algebra used and another name is relational calculus.
In this tutorial, we explore the most basic data structure in R, the vector. We cover everything from creating vectors to subsetting them in different ways.
This presentation educated you about R - Factors with example syntax and demo program of Factors in Data Frame, Changing the Order of Levels and Generating Factor Levels.
For more topics stay tuned with Learnbay.
'Business Analytics with 'R' at Edureka will prepare you to perform analytics and build models for real world data science problems. It is the world’s most powerful programming language for statistical computing and graphics making it a must know language for the aspiring Data Scientists. 'R' wins strongly on Statistical Capability, Graphical capability, Cost and rich set of packages.
Overview and about R, R Studio Installation, Fundamentals of R Programming: Data Structures and Data Types, Operators, Control Statements, Loop Statements, Functions,
Descriptive Analysis using R: Maximum, Minimum, Range, Mean, Median and Mode, Variance, Standard Deviation, Quantiles, IQR, Summary
The R language is a project designed to create a free, open source language which can be used as a replacement for the S-PLUS language, originally developed as the S language at AT&T Bell Labs, and currently marketed by Insightful Corporation of Seattle, Washington. R is an open source implementation of S, and differs from S-plus largely in its command-line only format.
Topics Covered:
1.Introduction to R
2.Installing R
3.Why Learn R
4.The R Console
5.Basic Arithmetic and Objects
6.Program Example
7.Programming with Big Data in R
8.Big Data Strategies in R
9.Applications of R Programming
10.Companies Using R
11.What R is not so good at
12.Conclusion
This presentation educates you about R - data types in detail with data type syntax, the data types are - Vectors, Lists, Matrices, Arrays, Factors, Data Frames.
For more topics stay tuned with Learnbay.
Dynamic Programming is a method for solving a complex problem by breaking it down into a collection of simpler subproblems, solving each of those subproblems just once, and storing their solutions using a memory-based data structure (array, map,etc).
As part of the GSP’s capacity development and improvement programme, FAO/GSP have organised a one week training in Izmir, Turkey. The main goal of the training was to increase the capacity of Turkey on digital soil mapping, new approaches on data collection, data processing and modelling of soil organic carbon. This 5 day training is titled ‘’Training on Digital Soil Organic Carbon Mapping’’ was held in IARTC - International Agricultural Research and Education Center in Menemen, Izmir on 20-25 August, 2017.
In DBMS (DataBase Management System), the relation algebra is important term to further understand the queries in SQL (Structured Query Language) database system. In it just give up the overview of operators in DBMS two of one method relational algebra used and another name is relational calculus.
In this tutorial, we explore the most basic data structure in R, the vector. We cover everything from creating vectors to subsetting them in different ways.
Exercise
1
[5
points]:
Create the following classes shown in the UML diagram. Then, create PointTest.java class with main method to test all functionality of these classes.
Exercise
2
[10
points]:
The following figure shows a UML diagram in which the class Student is inherited from the class
Person
a. Implement a Person class. The person constructor takes two strings: a first name and a last name. The constructor initializes the email address to the first letter of the first name followed by first five letters of the last name followed by @tru.ca. If the last name has fewer than five letters, the e-mail address will be the first letter of the first name followed by the entire last name followed by a @tru.ca. Examples:
Name
Email Address
Jane Smith
[email protected]
Musfiq Rahman
[email protected]
John Morris
[email protected]
Mary Key
[email protected]
b. Override Object’s toString method for the Person class. The toString method should return the present state of the object.
c. Now, create a Student class that is a subclass of Person and implements Comparable interface.
d. The Student constructor will be called with two String parameters, the first name and last name of the student. When the student is constructed, the inherited fields lastName, firstName, and email will be properly initialized, the student’s gpa and number of credit will be set to 0. The variable lastIdAssigend will be properly incremented each time a Student object is constructed and the studentId will be set to the next available ID number as tracked by the class variable lastIdAssigend.
e. Override the object’s toString method for the Student class. The toString method should return the present state of the object.
Note that it should use the toString() method from its superclass.
f. The addCourse() method should update the credits completed, calculate, and update the gpa value.
Use the following values for grade:
Example GPA calculation:
GRADE CREDIT CALCULATION
(A) 4.0 x 4 = 16.00
(B) 3.0 x 4 = 12.00
(B) 3.0 x 4 = 12.00
(A) 4.0 x 1 = 4.00
(C) 2.0 x 3 = 6.00
GPA = 50.00 / 16 = 3.125; the getGPA() method should return this value.
g. Students are compared to each other by comparing GPAs. Override the compareTo() method for the student class. Note that to override the compareTo() method, the Student class must implement Comparable interface.
Now, test your code with the supplied client code (StudentClient.java). Note: You should not modify this client code. We will use the same client code to test your classes.
Exercise
3
[10
points]:
In this exercise, you need to implement a class that encapsulate a Grid. A grid is a useful concept in creating board-game applications. Later we will use this class to create a board game. A grid is a two-dimensional matrix (see example below) with the same number of rows and columns. You can create a grid o ...
Deals with CSV Files operations in Pandas like reading, writing, performing joins and other operations in python using dataframes and Series in Pandas.
Matlab introductory course part 1 with the following agenda:
What is MATLAB
Manipulating Variables
Common Functions for Variables
Good Programming Practices
CIS 1403 lab 3 functions and methods in JavaHamad Odhabi
This lab discusses and provides examples of both built-in and user-defined functions. In Java function are referred to as methods. Therefore, in the rest of this lab, the term methods will be used to refer to functions. The lab will cover the type of methods, naming of functions, the scope of variables and recursion.
Abstract Data Types (a) Explain briefly what is meant by the ter.pdfkarymadelaneyrenne19
Abstract Data Types
(a) Explain briefly what is meant by the term abstract data type (ADT). Give two
reasons why use of ADTs is good programming practice.
(b) Write out a signature, or interface, that defines the operations of a stack ADT.
(c) Consider a string of characters of the form
... (.( ... ).) ...
where ... indicates an arbitrary sequence of characters (except for parentheses),
(.( indicates an arbitrary number (one or more) of opening parentheses, and
similarly ).) indicates an arbitrary number of closing parentheses.
Using only the stack abstraction operations defined above, write pseudocode for
an algorithm that determines, using a stack, whether or not the number of closing
parentheses is the same as the number of opening parentheses.
You may assume the existence of a function read(str,ch) that reads the next character
of string str into ch.
You may also assume that you can invoke a function reportFail, that will cause
termination with failure, and similarly, reportSuccess causes termination with a
success indication.
Further, you may also assume that you can call a function newStack(S) to create
a new empty stack S, and eos(str) that returns false when you reach the end of
the string.
Solution
(a) Explain briefly what is meant by the term abstract data type (ADT). Give two
reasons why use of ADTs is good programming practice.
A data type is a collection of values and a set of operations on those values. That collection and
these operations form a mathematical construct that may be implemented with the use of a
particular hardware or software data structure. The term abstract data type (ADT) refers to the
basic mathematical concept that defines the data type. We have discussed four different
implementations of the list data structure.
In case of implementation of the list with the use of an array, the size of the array gives difficulty
if increased.
To avoid this, we allocate memory dynamically for nodes before connecting these nodes with the
help of pointers.
For this purpose, we made a singly linked list and connected it with the next pointer to make a
chain.
Moving forward is easy but going back is a difficult task.
To overcome this problem, we made a doubly linked list using prev andnext pointers. With the
help of these pointers, we can move forward and backward very easily. Now we face another
problem that the prev pointer of first node and the next pointer of the last node are NULL.
Therefore, we have to be careful in case of NULL pointers. To remove the NULL pointers, we
made the circular link list by connecting the first and last node.
The program employing the list data structure is not concerned with its implementation.
We do not care how the list is being implemented whether through an array, singly linked list,
doubly linked list or circular linked list. It has been witnessed that in these four implementations
of the list, the interface remained the same i.e. it implements the same methods like add, get,
next, start a.
A comprehensive introduction to handling date and time data in R. Get an introduction to date and time manipulation in R. Learn to create, transform, extract and operate on date/time objects.
Learn the grammar of data manipulation using dplyr. You will work through a case study to explore the dplyr verbs such as filter, select, mutate, arrange, summarize, group_by etc.
Learn to write readable code with pipes using the magrittr package. You will learn about the forward operator (%>%), exposition operator (%$%) and the assignment operator (%<>%).
tibbles are an alternative for dataframes. You will learn how tibbles are different from dataframes, why you should use them, how to create and modify them.
Learn how to install & update R packages from CRAN, GitHub, Bioconductor etc. You wlll also learn to install specific versions of a package from CRAN or GitHub.
A brief introduction to the R ecosystem for absolute beginners. You will learn about the history and capabilities of R as a modern language for data science.
In this tutorial, we learn to access MySQL database from R using the RMySQL package. The tutorial covers everything from creating tables, appending data to removing tables from the database.
In this tutorial, we learn to create dynamic documents using R Markdown. It enables us to create beautiful reports and presentations that are fully reproducible.
In this tutorial, we learn to create univariate bar plots using the Graphics package in R. We also learn to modify graphical parameters associated with the bar plot.
Data Visualization With R: Learn To Combine Multiple GraphsRsquared Academy
In this tutorial, we learn to combine multiple graphs into a single frame using the par() and layout() functions. We also compare the differences between the two functions.
06-04-2024 - NYC Tech Week - Discussion on Vector Databases, Unstructured Data and AI
Round table discussion of vector databases, unstructured data, ai, big data, real-time, robots and Milvus.
A lively discussion with NJ Gen AI Meetup Lead, Prasad and Procure.FYI's Co-Found
Adjusting OpenMP PageRank : SHORT REPORT / NOTESSubhajit Sahu
For massive graphs that fit in RAM, but not in GPU memory, it is possible to take
advantage of a shared memory system with multiple CPUs, each with multiple cores, to
accelerate pagerank computation. If the NUMA architecture of the system is properly taken
into account with good vertex partitioning, the speedup can be significant. To take steps in
this direction, experiments are conducted to implement pagerank in OpenMP using two
different approaches, uniform and hybrid. The uniform approach runs all primitives required
for pagerank in OpenMP mode (with multiple threads). On the other hand, the hybrid
approach runs certain primitives in sequential mode (i.e., sumAt, multiply).
Levelwise PageRank with Loop-Based Dead End Handling Strategy : SHORT REPORT ...Subhajit Sahu
Abstract — Levelwise PageRank is an alternative method of PageRank computation which decomposes the input graph into a directed acyclic block-graph of strongly connected components, and processes them in topological order, one level at a time. This enables calculation for ranks in a distributed fashion without per-iteration communication, unlike the standard method where all vertices are processed in each iteration. It however comes with a precondition of the absence of dead ends in the input graph. Here, the native non-distributed performance of Levelwise PageRank was compared against Monolithic PageRank on a CPU as well as a GPU. To ensure a fair comparison, Monolithic PageRank was also performed on a graph where vertices were split by components. Results indicate that Levelwise PageRank is about as fast as Monolithic PageRank on the CPU, but quite a bit slower on the GPU. Slowdown on the GPU is likely caused by a large submission of small workloads, and expected to be non-issue when the computation is performed on massive graphs.
Chatty Kathy - UNC Bootcamp Final Project Presentation - Final Version - 5.23...John Andrews
SlideShare Description for "Chatty Kathy - UNC Bootcamp Final Project Presentation"
Title: Chatty Kathy: Enhancing Physical Activity Among Older Adults
Description:
Discover how Chatty Kathy, an innovative project developed at the UNC Bootcamp, aims to tackle the challenge of low physical activity among older adults. Our AI-driven solution uses peer interaction to boost and sustain exercise levels, significantly improving health outcomes. This presentation covers our problem statement, the rationale behind Chatty Kathy, synthetic data and persona creation, model performance metrics, a visual demonstration of the project, and potential future developments. Join us for an insightful Q&A session to explore the potential of this groundbreaking project.
Project Team: Jay Requarth, Jana Avery, John Andrews, Dr. Dick Davis II, Nee Buntoum, Nam Yeongjin & Mat Nicholas
Techniques to optimize the pagerank algorithm usually fall in two categories. One is to try reducing the work per iteration, and the other is to try reducing the number of iterations. These goals are often at odds with one another. Skipping computation on vertices which have already converged has the potential to save iteration time. Skipping in-identical vertices, with the same in-links, helps reduce duplicate computations and thus could help reduce iteration time. Road networks often have chains which can be short-circuited before pagerank computation to improve performance. Final ranks of chain nodes can be easily calculated. This could reduce both the iteration time, and the number of iterations. If a graph has no dangling nodes, pagerank of each strongly connected component can be computed in topological order. This could help reduce the iteration time, no. of iterations, and also enable multi-iteration concurrency in pagerank computation. The combination of all of the above methods is the STICD algorithm. [sticd] For dynamic graphs, unchanged components whose ranks are unaffected can be skipped altogether.
Data Centers - Striving Within A Narrow Range - Research Report - MCG - May 2...pchutichetpong
M Capital Group (“MCG”) expects to see demand and the changing evolution of supply, facilitated through institutional investment rotation out of offices and into work from home (“WFH”), while the ever-expanding need for data storage as global internet usage expands, with experts predicting 5.3 billion users by 2023. These market factors will be underpinned by technological changes, such as progressing cloud services and edge sites, allowing the industry to see strong expected annual growth of 13% over the next 4 years.
Whilst competitive headwinds remain, represented through the recent second bankruptcy filing of Sungard, which blames “COVID-19 and other macroeconomic trends including delayed customer spending decisions, insourcing and reductions in IT spending, energy inflation and reduction in demand for certain services”, the industry has seen key adjustments, where MCG believes that engineering cost management and technological innovation will be paramount to success.
MCG reports that the more favorable market conditions expected over the next few years, helped by the winding down of pandemic restrictions and a hybrid working environment will be driving market momentum forward. The continuous injection of capital by alternative investment firms, as well as the growing infrastructural investment from cloud service providers and social media companies, whose revenues are expected to grow over 3.6x larger by value in 2026, will likely help propel center provision and innovation. These factors paint a promising picture for the industry players that offset rising input costs and adapt to new technologies.
According to M Capital Group: “Specifically, the long-term cost-saving opportunities available from the rise of remote managing will likely aid value growth for the industry. Through margin optimization and further availability of capital for reinvestment, strong players will maintain their competitive foothold, while weaker players exit the market to balance supply and demand.”
2. R2
AcademyCourse Material
Slide 2
All the material related to this course are available on our website
Scripts can be downloaded from GitHub
Videos can be viewed on our Youtube Channel
4. R2
Academy
Slide 4
COLUMNS
1 2 3
R
O 4 5 6
W
S 7 8 9
10 11 12
A matrix is a rectangular array of data elements, arranged in rows and columns. Matrices in R are
homogeneous i.e. they can hold a single type of data. Matrix elements are indexed by specifying the
row and column index and the elements of a matrix can be filled by row or columns. In the first
section, we look at various methods of creating matrices in R.
5. R2
Academy
Slide 5
The easiest way to create a matrix in R is to use the function. Let us look at its
syntax:
data Data Elements of the matrix Integer/Numeric/Logical/Character
nrow Number of rows Integer
ncol Number of columns Integer
byrow Whether data should be filled by rows Logical
dimnames Names of rows and columns Character vector
6. R2
Academy
Slide 6
Now that we have understood the syntax of the function, let us create a simple
numeric matrix:
7. R2
Academy
Slide 7
In the previous example, we created a matrix of 3 rows where the data elements are filled by
columns. We need to specify either the number of or and R will automatically
calculate the other. The number of data elements should be equal to the product of number of
rows and columns, else R will return an warning message.
8. R2
Academy
Slide 8
We can follow some general rules to avoid the mistakes made in the
previous two examples:
● If the number of data elements are odd, both the number of rows
and columns must be odd and their product should equal the
number of data elements.
● If the number of data elements are even, either the number of
rows must be even or the number of columns must be even. In
certain cases, both of them must be even.
9. R2
Academy
Slide 9
Let us continue to explore the syntax of the function. Let us create two matrices, the data
elements of which are filled by rows in the first case, and columns in the second case.
10. R2
Academy
Slide 10
Either the number of rows or columns need to be specified and R will calculate the other one automatically. We create
two matrices below, the first one specified by rows and the second one by columns.
11. R2
Academy
Slide 11
If we want to specify the names of the rows and columns, we need to use a data structure called . Lists can
contain other data structures including other lists. They are heterogeneous i.e. they can contain different data types.
We will learn more about lists in the next unit. For now, let us learn to create a basic list. Lists in R can be created using
the function.
12. R2
Academy
Slide 12
Let us now create a list of row and column names and use it to name the rows and columns of a
matrix.
13. R2
Academy
Slide 13
Another method to create a matrix is to use the function. It is basically used to check or specify the dimensions
of a data structure. In case of matrices, it returns the number of rows and columns. Let us look at a few examples:
14. R2
Academy
Slide 14
In the below example, we use the function to change the dimension of the matrix.In the dim function, we need to
mention both the number of rows and columns using the function. We change the rows from 3 to 4 and the
columns from 4 to 3.
15. R2
Academy
Slide 15
In the below example, we use the function to change row from 2 to 6 and the columns from 6 to 2.
16. R2
Academy
Slide 16
Now that we have understood the function, let us use it to convert vectors to matrices. Below are a few examples:
18. R2
Academy
Slide 18
The last method that we will explore in this section is the function. It is used to coerce a
data structure to the type . Since the only other data structure that we have covered so far is
the vector, we will coerce a vector to type We will deal with other data structures as and
when we learn about them.
19. R2
Academy
Slide 19
Regardless of the data type of vector, all of them are coerced to a of dimension n x 1 i.e. they
will all have only one column.
20. R2
Academy
Slide 20
In this section, we will cover the following:
● Matrix Addition
● Matrix Subtraction
● Matrix Division
● Transpose of a Matrix
● Matrix Multiplication
● Inverse of a Matrix
The four basic operations of addition, subtraction, multiplication and division can be done by element
wise or with a scalar value. We will be looking at both cases. In the case of multiplication, we need to
compute the transpose of the matrix before we can do element wise multiplication.
26. R2
Academy
Slide 26
We need to follow the basic rules of matrix multiplication i.e. the number of columns in the first matrix
should be equal to the number of rows in the second matrix. Let us look at an example:
28. R2
Academy
Slide 28
In this section, we will focus on appending vector to matrices and combining matrices. There are two
functions that can be used for this purpose:
●
●
will combine/append the data by columns while will do the same by rows. When you
use to combine two matrices, the number of columns must match and in case of , the
number of rows must match.
33. R2
Academy
Slide 33
In this section, we will learn to index/subset elements of a matrix. The operator can be used to index
the elements as we did in case of vectors but since matrices are two dimensional, we need to specify
both the row number and the column number. Below are a few examples:
36. R2
Academy
Slide 36
In an earlier section, we learnt how to name the rows and columns of a matrix. Let us see how these
names can be used to subset matrices.
37. R2
Academy
Slide 37
When you are using names of columns or rows for subsetting data from matrices, ensure that they
are enclosed in single or double quotes.
39. R2
Academy
Slide 39
So far, we have learnt how to coerce a vector to a matrix. In this final section, we will learn to
coerce a matrix to a vector. We can use the following functions:
●
●
40. R2
Academy
Slide 40
● Matrices are two dimensional arrays.
● They are homogeneous i.e. they can hold single type of data.
● The easiest way to create a matrix is by using the function.
● The function can be used to specify the dimensions of a matrix.
● They can be indexed using or names of rows/columns.
● Out of range index returns error.
● Negative index drops row/column from the matrix.
● Use function for transpose and function for inverse of a matrix.
● and can be used to append vectors and combine matrices.
● Logical expressions can be used to subset matrices.
42. R2
Academy
Slide 42
Visit Rsquared Academy
for tutorials on:
→ R Programming
→ Business Analytics
→ Data Visualization
→ Web Applications
→ Package Development
→ Git & GitHub