MATLAB programming for engineers
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The document discusses loops in MATLAB, which allow repeated computations on different numeric values without writing multiple lines of code. It provides examples of for loops to compute values in a vector or matrix based on an incrementing index variable. Nested loops are also demonstrated, where one loop is contained within another. Tasks are assigned for readers to write MATLAB functions using for loops to cube values in a vector, compute savings growth over time with interest and bonuses, and plot the results.
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Input
Expected Output
1
value=1
value=1
value=1
value=0
value=1
value=2
value=0
value=1
value=3
value=2
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value=200
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Pseudocode:
// This program will calculate the sum of 10 integers.
// Declare variables
Declare count, value, sum as Integer
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Set count=0
Set sum = 0
// Loop through 10 integers
While count < 10
Print “Enter an Integer”
Input value
sum = sum + value
count=count+1
End While
// Print results and messages
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// C code
// This program will calculate the sum of 10 integers.
// Developer: Faculty CMIS102
// Date: Jan 31, 2014
#include <stdio.h>
int main ()
{
/* variable definition: */
int count, value, sum;
/* Initialize count and sum */
count = 0;
sum = 0;
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{
printf("Enter an Integer\n");
scanf("%d", &value);
sum = sum + value;
count = count + 1;
}
printf("Sum is %d\n " , sum );
if (sum >1000)
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#include "leds.h"
#include <stdio.h> /* for printf() */
static struct etimer timer;
/*____________________________________________________*/
PROCESS(led_blinking_process, "LED Blinking Process");
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/*____________________________________________________*/
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// Week 4
Overview:
This hands-on lab allows you to follow and experiment with the critical steps of developing a program including the program description, analysis, test plan, design (using both flow chart and pseudocode visualization), and implementation with C code. The example provided uses sequential, selection and repetition statements.
Program Description:
This program will calculate the sum of 10 integers. The program will ask the user to 10 integers. If the sum of the numbers is greater than 1000, a message is printed stating the sum is over 1000. The design step will include both pseudocode and flow chart visualization.
Analysis:
I will use sequential, selection and repetition programming statements.
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while count <10
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sum = sum + value
End while
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If sum > 1000 then
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End If
Test Plan:
To verify this program is working properly the input values could be used for testing:
Test Case
Input
Expected Output
1
value=1
value=1
value=1
value=0
value=1
value=2
value=0
value=1
value=3
value=2
Sum = 12
2
value=100
value=100
value=100
value=100
value=100
value=200
value=200
value=200
value=200
value=200
Sum = 1200
Sum is over 1000.
3
value=-100
value=-100
value=-200
value=0
value=200
value=100
value=0
value=200
value=-300
value=-200
Sum = -400
Pseudocode:
// This program will calculate the sum of 10 integers.
// Declare variables
Declare count, value, sum as Integer
//Initialize Counter, Sum to 0
Set count=0
Set sum = 0
// Loop through 10 integers
While count < 10
Print “Enter an Integer”
Input value
sum = sum + value
count=count+1
End While
// Print results and messages
Print “Sum is “ + sum
If (sum > 1000)
Printf “Sum is over 1000”
End if
Flow Chart:
C Code
The following is the C Code that will compile in execute in the online compilers.
// C code
// This program will calculate the sum of 10 integers.
// Developer: Faculty CMIS102
// Date: Jan 31, 2014
#include <stdio.h>
int main ()
{
/* variable definition: */
int count, value, sum;
/* Initialize count and sum */
count = 0;
sum = 0;
// Loop through to input values
while (count < 10)
{
printf("Enter an Integer\n");
scanf("%d", &value);
sum = sum + value;
count = count + 1;
}
printf("Sum is %d\n " , sum );
if (sum >1000)
printf("Sum is over 1000\n");
return 0;
}
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1. Introduction
In Demo3, we have learned how to read sensor values of light, temperature and humidity of a node
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learn how to turn on/off the LEDs and make them blinking regularly on the sensor node XM1000,
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In order to make the blue LED on the XM1000 sensor node to blink in every half second (i.e. On 0.5S
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We aslo need to create an infinite while() loop so that it runs our functions repeatedly, such as
counting the times the LED has blinked, output the counter’s value and actually turn on or off the
LEDs to make it blinking.
Please follow timer and while() loop structure in Demo3.
3. LED Blinking
To get access to the LED functionalities in Contiki, we need to include the LED header file in the
source code:
#include "leds.h" // file is in directory /home/user/contiki/core/dev
After the process begin, we have to initialise the LEDs on the sensor node by calling the following
function:
leds_init(); // Initialise the LEDs
And finally we can turn on, off, or blink the LEDs by the following functions:
void leds_on(unsigned char leds);
void leds_off(unsigned char leds);
void leds_toggle(unsigned char leds);
void leds_invert(unsigned char leds);
For example, if you want to blink the Blue LED, yon need to call the toggle function as:
void leds_toggle(LEDS_BLUE); // Toggle the blue LED
4. Exercise
Modify the program from Demo3 with periodic timer to make the BLUE led blinking in every half
second, also to count the blinking times and output the counted number to the console.
Can your change the code so that the BLUE LED is lighted for 1 second and off for 0.5 second
periodically?
15LLP108 – Internet of Things and Applications
Lab Session 2: Demo 4 – LED Blinking
Prepared by Xiyu Shi
5. Source code
Here is the source code for reference
#include "contiki.h"
#include "leds.h"
#include <stdio.h> /* for printf() */
static struct etimer timer;
/*____________________________________________________*/
PROCESS(led_blinking_process, "LED Blinking Process");
PROCESS(LED_process, "LED process");
AUTOSTART_PROCESSES(&LED_process);
/*____________________________________________________*/
PROCESS_THREAD(LED_process, ev, data)
{
static int count = 0;
PROCESS_BEGIN();
etimer_set(&timer, CLOCK_CONF_SECOND/2); // 0.5S timer
leds_init(); // intialise the LEDs
while(1) {
PROCESS_WAIT_EVENT_UNTIL(ev==PROCESS_EVENT_TIMER); // wait for timer event
count++; // count the blinking times
process_start(&led_blinking_process, NULL); // to blink the BLUE Led
printf("Count: %d\n", count); // output the counte ...
Mini Project- ROM Based Sine Wave Generator
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• To use Matlab® (Simulink®)
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MATLAB programming for engineers
- 1. Overheads and Flash lectures for Introduction to MATLAB for engineers Anthony Rossiter Department of Automatic Control and Systems Engineering University of Sheffield www.shef.ac.uk/acse © University of Sheffield 2009 This work is licensed under a Creative Commons Attribution 2.0 License.
- 2. Loops Anthony Rossiter ACS108 Department of Automatic Control and Systems Engineering
- 3. Loops are essential Code allows repeated numerical computations. We do not want to write line of code 10 times to do the same thing with different numbers. We want to tell the computer to use the same line, but with different numbers. Look at the example on next page.
- 4. week2_loops_essential.m Open the file. Two ways to compute 6 values First look at lines 11-16 Or try lines 19-21 Now imagine you needed to do this for 100 different values, or a 1000. Using a loop is simple to code and efficient.
- 5. How does a loop work? for k=1:6; y2(k)=sin(xvalues(k)); end … more code First k=1 hence do y2(1)=sin(xvalues(1)); Back to start of loop Now k=2 hence do y2(2)=sin(xvalues(2)); Now k=3 hence do Y2(3)=sin(xvalues(3)); Now k=4 hence do y2(4)=sin(xvalues(4)); Now k=5 hence do y2(5)=sin(xvalues(5)); Now k=6 hence do y2(6)=sin(xvalues(6)); Now k=6 is equal to max of allowed k, continue to next line of code
- 6. How to write the statement k takes the values 3,4,5,6,7,8 for k=3:8 code end for k=8:-2:2 code end k takes the values 8,6,4,2 for k=4:3:13 code end k takes the values 4,7,10,13
- 7. General examples of for loops Open the file week2_for.m Note the call statement has 3 variables. Run in the command window Note values of k are: start, start+step, start+2*step,…,start+6*step
- 8. Nested loops Open week2_for2.m Note that one loop is inside another loop. First k=1 and then l goes from 1 to 5. First k=2 and then l goes from 1 to 5. …. Finally k=10 and then l goes from 1 to 5. Inner loop Outer loop Run the file and experiment with changing the loop for statements
- 9. TASKS Use help week2_loop_for_plotting.m and determine how to run this file and also how it works. Write a function file which takes as its input a vector of arbitrary length and then use a loop to define the output vector whose values are the cubes of the coefficients of the first vector plus one. The syntax could be: output_vector= week2_loop_cube(input_vector) Write a file to compute savings growth over time. For instance, let savings with an interest rate of 5% and annual bonus of £5 grow according to the model: Write a file with syntax Pounds=savings_growth(Pounds_in, interest_rate, annual_bonus,years_invested) The file should also plot savings growth.
- 10. This resource was created by the University of Sheffield and released as an open educational resource through the Open Engineering Resources project of the HE Academy Engineering Subject Centre. The Open Engineering Resources project was funded by HEFCE and part of the JISC/HE Academy UKOER programme. © 2009 University of Sheffield This work is licensed under a Creative Commons Attribution 2.0 License. The JISC logo is licensed under the terms of the Creative Commons Attribution-Non-Commercial-No Derivative Works 2.0 UK: England & Wales Licence. All reproductions must comply with the terms of that licence. The HEA logo is owned by the Higher Education Academy Limited may be freely distributed and copied for educational purposes only, provided that appropriate acknowledgement is given to the Higher Education Academy as the copyright holder and original publisher. The name and logo of University of Sheffield is a trade mark and all rights in it are reserved. The name and logo should not be reproduced without the express authorisation of the University. Where Matlab® screenshots are included, they appear courtesy of The MathWorks, Inc.