solve a issue regarding saving a variable to mat file.

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sarika 2014-9-25

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https://ww2.mathworks.cn/matlabcentral/answers/156120-solve-a-issue-regarding-saving-a-variable-to-mat-file

评论： Star Strider 2014-9-26

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

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Answer 1

Star Strider 2014-9-25

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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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sarika 2014-9-26

编辑：sarika 2014-9-26

Thanks a lot for your quick response sir.

I changed the code as you mentioned . Now it works.

Star Strider 2014-9-26

My pleasure!

If you have other problems, we’re here to help.

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Answer 2

Michael Haderlein 2014-9-25

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https://ww2.mathworks.cn/matlabcentral/answers/156120-solve-a-issue-regarding-saving-a-variable-to-mat-file#answer_152850

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This error (Error using save Unable to write file ecgta1: permission denied.) says that you don't have writing permission at the directory you have chosen. As you haven't specified the directory, it will save the file just in the current directory which puzzles me a bit. Usually you do have access there. Can you please post here what

pwd

returns?