MATLAB: Index exceeds matrix dimensions for fprinf

fprintf

Hi there,
I kept getting this message below. I would appreciate it if you could help me out.
Here is the the code I ran below
formatSpec = '%s\t %.15f\t %.15f\t %.15f\n';
fid = fopen('sineBurstAnalysis.txt','w');
fprintf (fid, '%s\t %s\t %s\t %s\n',...
    'FileName','CVburstDuration','CVburstTP','CVburstAMP');
for r = 1:8
    fprintf(fid,formatSpec,ddd(1,r).name, cvDuration_1(1,r), cvTTP_1(1,r), cvAMP_1(1,r));
end
fclose(fid);
Here is the error message I got below.
Index exceeds matrix dimensions.
Error in sineBurstAnalysis_test1 (line 160)
    fprintf(fid,formatSpec,cvDuration_1(1,r), cvDuration_1(1,r), cvTTP_1(1,r),
    cvAMP_1(1,r));
Thank you for your help!

Best Answer

Use the debugger to check the cause of the error: https://www.mathworks.com/help/matlab/matlab_prog/debugging-process-and-features.html . Set a breakpoint in the failing line, or even better let Matlab stop automatically at the error:
dbstop if error
Now run the code again until it stops. The error message is clear: one of the used variables does not have as many elements as requested:
size(ddd)
size(cvDuration_1)
size(cvTTP_1)
size(cvAMP_1)
The forum cannot suggest a way to fix the problem, because we cannot know, how these variables have been created. But the debugger will help you here also.
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