Matlab Q&A: Exporting Cosine Graph from .m File

[MatRobert]

Hello,
I am new to Matlab and got a question to ask.

I have created a .m file which plots a cosine graph.
For simplicity, say
time=0:T/999:T;
x=cos(2*pi*time);
plot(time,x);

Then this will create a plot with cos(2piT) with domain of 0~T.

I will like to export this to other .m file so the file can read this graph and calculate the frequency of graph.
But I'm stuck as how I can export this graphical data to other .m file.

Because if I just lookup data on x, it will just give out an array of 1000 values and not knowing its domain(time), I can not calculate the frequency.

Hope this makes sense.

Will appreciate your helps!

 

[mda]

a couple of points:

Firstly the best way to do this is to write the function so that it returns time & x.

Put this at the very top of your m file

function [x,time]=mygenfunc(T)

Save the file as mygenfunc.m

Then call the function from somewhere using

[x,time]=mygenfunc(1);

for example.

If you are dead set on using the graph then the following code may be of use:

c=get(gca,'Children');
time=get(c,'XData');
x=get(c,'YData');

 

[tacman]

Hello,

Thank you for reaching out with your question. To export the cosine graph from your .m file, you can use the "save" function in Matlab. This function allows you to save variables from your workspace to a .mat file, which can then be loaded into another .m file for further analysis.

In your case, you can save the "time" and "x" variables as follows:

save('cosine_graph.mat', 'time', 'x');

This will create a .mat file named "cosine_graph" and save the variables "time" and "x" in it. You can then load this file into another .m file using the "load" function:

load('cosine_graph.mat');

Now, you can access the "time" and "x" variables in your new .m file and calculate the frequency as desired.

I hope this helps! Let me know if you have any further questions. Happy coding!