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Also See more posts : www.comsciguide.blogspot.com
Also See more posts : www.comsciguide.blogspot.com
Why Analysis of algorithms :
An algorithm is a step by step procedure i.e. a set of
instructions to solve the given problem. For a problem there can
be many algorithms to solve it. But how to find the best algorithm
among those?. Analysis of algorithms helps in determining the
solution for it.
What does it mean?
For example if a person wants to travel from one place A to
another place B, there can be many routes to reach from A to B.
Depending on the availability and convenience we can choose the
best route in terms of short route (if we want to reach fast),
Highway (Even though it is longer, but for convenience) etc.
Similarly in Computer Science, there can be many algorithms
for a same problem. Analysis of algorithms helps us in determining
which of them is efficient in terms of space (memory) and running
time by comparing the algorithms. But how to compare algorithms
?
Also See more posts : www.comsciguide.blogspot.com
Also See more posts : www.comsciguide.blogspot.com
How to compare algorithms ?
Running time is best measure for comparing the algorithms.
It is the process of determining the processing time increases as
the size of input size (problem) increases. Input size may vary
depending on the type of problems. In general we encounter the
following types of inputs.
1) Size of array
2) No of elements in the matrix
3) Polynomial degree
4) Vertices and edges in a graph
In general, the running time of a algorithm is expressed as a
function of input size(n) i.e. f(n) and compare these functions
corresponding with their running times. This is independent of
machine time, processor, programme style (no of statements) etc.
Types of analysis :
To analyse the algorithm, we need to represent the algorithm
with multiple expressions: one for the case where it takes less time
Also See more posts : www.comsciguide.blogspot.com
Also See more posts : www.comsciguide.blogspot.com
and the other for the case where it takes more time. The first case
is called as Best case and the second case is called as Worst case
for that algorithm. There are three types of analysis:
1) Best case
2) Average case
3) Worst case
For a given algorithm, we can represent the best, worst, average
cases in the form of expressions.
For example
Let f(n) be the function represents the given algorithm and n
is the input size,
f(n) = n2
+ n + 100 ; for worst case
f(n) = 5n + 200 ; for best case
The expressions defines the input for which the algorithm takes
the less or average time (or memory). If both best and worst
Also See more posts : www.comsciguide.blogspot.com
Also See more posts : www.comsciguide.blogspot.com
cases, points to one expression then that expression can be
represented with average case.
f(n) = 10n + 50 ; for best and worst case
then f(n) can be represented for average case.
f(n) = 10n + 50 ; for average case

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How analysis of algorithms is done?

  • 1. Also See more posts : www.comsciguide.blogspot.com Also See more posts : www.comsciguide.blogspot.com Why Analysis of algorithms : An algorithm is a step by step procedure i.e. a set of instructions to solve the given problem. For a problem there can be many algorithms to solve it. But how to find the best algorithm among those?. Analysis of algorithms helps in determining the solution for it. What does it mean? For example if a person wants to travel from one place A to another place B, there can be many routes to reach from A to B. Depending on the availability and convenience we can choose the best route in terms of short route (if we want to reach fast), Highway (Even though it is longer, but for convenience) etc. Similarly in Computer Science, there can be many algorithms for a same problem. Analysis of algorithms helps us in determining which of them is efficient in terms of space (memory) and running time by comparing the algorithms. But how to compare algorithms ?
  • 2. Also See more posts : www.comsciguide.blogspot.com Also See more posts : www.comsciguide.blogspot.com How to compare algorithms ? Running time is best measure for comparing the algorithms. It is the process of determining the processing time increases as the size of input size (problem) increases. Input size may vary depending on the type of problems. In general we encounter the following types of inputs. 1) Size of array 2) No of elements in the matrix 3) Polynomial degree 4) Vertices and edges in a graph In general, the running time of a algorithm is expressed as a function of input size(n) i.e. f(n) and compare these functions corresponding with their running times. This is independent of machine time, processor, programme style (no of statements) etc. Types of analysis : To analyse the algorithm, we need to represent the algorithm with multiple expressions: one for the case where it takes less time
  • 3. Also See more posts : www.comsciguide.blogspot.com Also See more posts : www.comsciguide.blogspot.com and the other for the case where it takes more time. The first case is called as Best case and the second case is called as Worst case for that algorithm. There are three types of analysis: 1) Best case 2) Average case 3) Worst case For a given algorithm, we can represent the best, worst, average cases in the form of expressions. For example Let f(n) be the function represents the given algorithm and n is the input size, f(n) = n2 + n + 100 ; for worst case f(n) = 5n + 200 ; for best case The expressions defines the input for which the algorithm takes the less or average time (or memory). If both best and worst
  • 4. Also See more posts : www.comsciguide.blogspot.com Also See more posts : www.comsciguide.blogspot.com cases, points to one expression then that expression can be represented with average case. f(n) = 10n + 50 ; for best and worst case then f(n) can be represented for average case. f(n) = 10n + 50 ; for average case