How to Stretching and shrinking a graph

I have the function y = sin(x) and i have to stretching the graph of it. I have also to shrinking it. How can i write this in matlab?

x = 1:.01:10; y = sin(x); for i = 1 : length(y)

how i have to continue...???

Thanks in advance!!!

[sixwwwwww]

What do you mean by stretching or shrinking? and also by the "sin" is a built-in function in MATLAB so don't use as name of your function. Do you want to input some scaling factor as input in you code and want out be scaled accordingly?

Answer 1

[sixwwwwww]

Beside the comment you can do something like this:

scaling_factor = 2; % define the scaling factor and graph will scale accordingly
x = 1:.01:10 * scaling_factor; 
y = sin(x);
figure, plot(x, y), title(strcat('Scaling factor = ', num2str(scaling_factor)))

I hope it helps. Good luck!

[Antonella]

Thanks really much for this help! ;)

Answer 2

[Wayne King]

You can simply dilate the independent variable in the function

   x = 0:0.01:10;
   y = sin(x);
   y2 = sin(x/2);
   plot(x,y); hold on;
   plot(x,y2,'r')

To shrink the function:

y3 = sin(2*x);
plot(x,y3,'k')

[Antonella]

Thanks very much for your availability and your help! ;)