How to Stretching and shrinking a graph

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Antonella
Antonella 2013-10-30
评论： Antonella 2013-10-30
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!!!
  1 个评论
sixwwwwww
sixwwwwww 2013-10-30
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?

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回答（2 个）

sixwwwwww
sixwwwwww 2013-10-30
编辑：sixwwwwww 2013-10-30
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!
Wayne King
Wayne King 2013-10-30
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')

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