MATLAB: Solve a issue regarding saving a variable to mat file.

ecg signalsave

I am doing project on Automated Detection of Arryhthmias .As initial process I need a ECG signal, for that I downloaded rddata.m and ECG recordings of MIT database. For further processing I need only channel 1 or channel 2 output .So, now need to save channel 1 signal ,For that I wrote below lines at the end of rddata.m
ecg1=M(:,1); % channel 1 output
save ecg1
Running radata.m after above modification it give this error
_ *Error using save Unable to write file ecgta1: permission denied.
Error in rddata3 (line 165) save ecgta1;* _
can anyone please help me to solve this issue.
Thanks in advance

Best Answer

The save call as you wrote it will all your current workspace variables to your file.
To save only your ‘ecg1’ variable to a .mat file named ‘ecg1.mat’, you have to define that specifically. See if this works:
save('ecg1.mat', 'ecg1')
(I did not test this code, but it should work.)
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