lecture (5) programming (2) eng. osama talaat 1. announcement m-files are available: download the...

1Lecture (5)

Programming (2)Eng. Osama Talaat

2 Announcement M-Files are available:

Download the file from the course page www.osamatalaat.com/matlab

Copy it into the current directory

Open it using MATLAB (Open, Double click, ... )

Run !!

3

clear all;

close all;

clc;

% n=input('Please enter the number of cycles: ');

% f=input('Please enter the frequency: ');

% A=input('Please enter the Amplitude: ');

x=[0:0.1:2*pi];

y=sin(x);

plot(x,y)

xlabel('x')

ylabel('sin(x)')

title('Sine Curve')

grid

disp('The amplitude values are: ')

y

disp('Plotting Done Successfully!!')

Clean

Start

4

clear all;

close all;

clc;

n=input('Please enter the number of cycles: ');


% A=input('Please enter the Amplitude: ');

x=[0:0.1:2*pi*n];

y=sin(x);

plot(x,y)

xlabel('x')

ylabel('sin(x)')

title('Sine Curve')

grid


y


No of Cylces

5

clear all;

close all;

clc;



A=input('Please enter the Amplitude: ');

x=[0:0.1:2*pi*n];

y=A*sin(x);

plot(x,y)

xlabel('x')

ylabel([num2str(A) 'sin(x)'])

title('Sine Curve')

grid


y


Amplitude

6

clear all;

close all;

clc;


f=input('Please enter the frequency: ');


x=[0:0.1:2*pi*n/f];

y=A*sin(f*x);

plot(x,y)

xlabel('x')

ylabel([num2str(A) 'sin(' num2str(f) 'x)'])

title('Sine Curve')

grid


y


Frequency

7

clear all;

close all;

clc;




x=[0:0.1:2*pi*n/f];

y=A*sin(f*x);

plot(x,y)

xlabel('x')


title('Sine Curve')

grid


y

disp('Program Terminated !!')

Done !!

8

clear all;

close all;

clc;




x=[0:0.1:2*pi*n/f];

y=A*sin(f*x);

plot(x,y)

xlabel('x')


title('Sine Curve')

grid


y


Output

9

clear all;

close all;

clc;




x=[0:0.1:2*pi*n/f];

y=A*sin(f*x);

plot(x,y)

xlabel('x')


title('Sine Curve')

grid


disp(y)


Output

10 Plot Sine Try n = any negative number:

11

clear all;

close all;

clc;




if n>0

x=[0:0.1:2*pi*n/f]; y=A*sin(f*x);

plot(x,y)

xlabel('x');


title('Sine Curve'); grid

disp('The amplitude values are: '); disp(y)

end


12 If Statement

if conditions________________________

______ Commands ________

________________________

end

________________________

______ Commands ________

________________________

13

clear all;

close all;

clc;




if n>0

x=[0:0.1:2*pi*n/f]; y=A*sin(f*x);

plot(x,y)

xlabel('x');




else

disp('The number of cycles must be positive')

end


Error Msg

14 If Else Statement

if conditions________________________

______ Commands ________

________________________

else

________________________

______ Commands ________

________________________

end

________________________

______ Commands ________

________________________

15

...

if n>0

x=[0:0.1:2*pi*n/f]; y=A*sin(f*x);

plot(x,y); xlabel('x');




else


end

......................................................

if n>0

x=[0:0.1:2*pi*n/f]; y=A*sin(f*x);

plot(x,y); xlabel('x');




end

if n<=0


end

...

Compare

16

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

% Designed by: Eng. Osama Talaat %

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

clear all; close all; clc;




if n>0 %Check positive number of cyclesx=[0:0.1:2*pi*n/f]; y=A*sin(f*x);

plot(x,y)

xlabel('x');




else


end


Comments

17

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%





if n>0 %Check positive number of cycles

x=[0:0.1:2*pi*n/f]; y=A*sin(f*x);

plot(x,y)

xlabel('x');



% disp('The amplitude values are: '); disp(y)

else


end


Comments

18 Password Enter the password.

If the entered password is ‘a13’, display a welcome message ‘Welcome Osama’.

Else, Display an error message ‘Wrong password’.

19

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


pass = input('Please enter password: ','s');

if strcmp(pass,'a13')

disp('Welcome Osama')

else

disp('Wrong password')

end

To enter stringTo

compare strings

20 Password Enter the password.

If the entered password is ‘a13’, display a welcome message ‘Welcome Osama’.

If the entered password is ‘com’, display a welcome message ‘Welcome Hamdy’.

If the entered password is ‘t10’, display a welcome message ‘Welcome Mona’.

Else, Display an error message ‘Wrong password’.

21

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

clear all;

close all;

clc;


if strcmp(pass,'a13')


elseif strcmp(pass,'com')

disp('Welcome Hamdy')

elseif strcmp(pass,'t10')

disp('Welcome Mona')

else


end

22 If Elseif Statementif conditions 1

______________________________ Commands ________________________________

elseif conditions 2______________________________ Commands ________________________________

elseif conditions 3______________________________ Commands ________________________________

...else

______________________________ Commands ________________________________

end______________________________ Commands ________________________________

23 Switch Case Statementswitch variable

case value 1______ Commands ________

break case value 2

______ Commands ________

break case value 3

______ Commands ________

break . . .otherwise

______ Commands ________

break end______________________________ Commands ________________________________

24

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

clear all;

close all;

clc;


switch pass

case 'a13'


break

case 'com'


break

case 't10'


break

otherwise


break

end

Another Solution

25

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

clear all;

close all;

clc;


switch pass

case 'a13'


break

case 'com'


break

case 't10'


break

otherwise

error('Wrong password')

break

end

Error Msg

The error message stops execution

26 Length Units Converter Convert the length from meter to several

length units.

Enter the length in meters.

Enter the unit to convert to.

Switch on the unit and upon its values multiply the input length by the conversion factor, and display the output

27

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


len = input('Please enter Length in meter: ');

unit = input('Please enter the unit to convert to: ','s');

switch unit

case 'cm'

disp([num2str(len) ' m = ' num2str(len*100) ' cm'])

break

case 'mm'

disp([num2str(len) ' m = ' num2str(len*1000) ' mm'])

break

case 'in'

disp([num2str(len) ' m = ' num2str(len/0.0254) ' in'])

break

otherwise

disp('This unit is not supported')

break

end

Several values

28

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


len = input('Please enter Length in meter: ');

unit = input('Please enter the unit to convert to: ','s');

switch unit

case {'cm' 'centimeter'}

disp([num2str(len) ' m = ' num2str(len*100) ' cm'])

break

case {'mm' 'millimeter'}

disp([num2str(len) ' m = ' num2str(len*1000) ' mm'])

break

case {'in' 'inch'}

disp([num2str(len) ' m = ' num2str(len/0.0254) ' in'])

break

otherwise

disp('This unit is not supported')

break

end

29 For Loopclear all; close all; clc;

for k=1:20

disp(rand) %do not display "ans ="

end

________________________________________

for index = vector________________________

__ Commands to repeat __

________________________

end

________________________

______ Commands ________

________________________

30 Calculate the Formula

>> s=0;

>> s=s+1^2/factorial(1);





31 Calculate the Formulaclear all; close all; clc;

s=0;

for k=1:5

s=s+k^2/factorial(k);

end

disp(s)

32 Test Yourself !!

Try it using matrices:

33GOOD LUCK

To be continued in the next lecture …

lecture (5) programming (2) eng. osama talaat 1. announcement m-files are available: download the...

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