Large integers saved as csv files are rounded up

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Jacques Barsimantov
Jacques Barsimantov on 4 Jul 2022
Answered: dpb on 4 Jul 2022
I have a very large data set called "el_inter" where the last numbers are very large integers. In Matlab,
el_inter(end-1) = 999964
el_inter(end-2) = 999963
clearly two different numbers (equivalent to cells 301689 and 301690 in the following Excel screenshots).
However, when I save it as a csv file using
The large integers are saved with scientific notation
in Excel then I change the format to general but it rounds the number so I get
Therefore, my data set has been altered and can't be used outside of Matlab.
How do I save all the data without rounding?
I have attached the data set variable.

Accepted Answer

dpb on 4 Jul 2022
WAD. Per the doc csvwrite (NOT recommended, btw),
  • csvwrite writes a maximum of five significant digits....
Use writematrix instead, although if the point is to open the file in Excel, I'd strongly suggest to write an Excel .xlsx file to begin with and forego the CSV file entirely.

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