Index exceeds matrix dimensions for fprinf

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!

Answer 1

[Jan]

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.

Answer 2

[Star Strider]

If your data are column vectors rather than row vectors, you will get that error:

x = rand(5,1);                          % Column Vector
q = x(1,3);

Index exceeds matrix dimensions.

Error in ... (line ###)
q = x(1,3);

The solution for that is to only use one index to refer to elements of a vector, rather than two.

Answer 3

[FLGATOR]

I resolved the issue. I appreciate all of your help!