Matlab writes junk #N/D in Excel file

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farzad
farzad on 23 Jul 2018
Commented: farzad on 24 Jul 2018
Hi All
I should write an array of 50000x2 from MATLAB to an Excel file, the problem is MATLAB doesn't leave the next rows free and writes something like : #N/D till the line 1 milion !!!
So I should delete it all, but I have so many files
could someone kindly propose a solution ?
  2 Comments
dpb
dpb on 23 Jul 2018
Would have to see the code that seemed to cause the problem and probably have the data as well.
Are you sure the sheet(s) weren't already that way first?
farzad
farzad on 23 Jul 2018
Matlab creates that file, so the files did not exist before even , my part of the code to make the excel file and write the array to that is :
Xsig = [t,Xavp];
xlswrite(name, Xsig, 1, 'A:B');
up, Xavp is a 50,000x1 array, which will be added to Xsig together with time, with the same length, I believe that a random big array will behave the same here

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Accepted Answer

OCDER
OCDER on 23 Jul 2018
Edited: OCDER on 23 Jul 2018
Either specify the exact excel range to write to, or don't specify it at all.
Xsig = rand(10, 2);
xlswrite('test.xlsx', Xsig, 1, sprintf('A1:B%d', size(Xsig, 1)));
OR
Xsig = rand(10, 2);
xlswrite('test.xlsx', Xsig, 1);
When you say write to 'A:B', Matlab has an odd behavior to fill EVERY cell in columns A and B with something. Hence, the 1 million rows of N/A's
  4 Comments
OCDER
OCDER on 23 Jul 2018
xlswrite(name, Xsig, 1, 'A:B');
^ sheet number
You could try
doc xlswrite
help xlswrite

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