Why is there loss of precision when writing values using CSVWRITE in MATLAB 7.0 (R14)?

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MathWorks Support Team
MathWorks Support Team on 27 Jun 2009
I execute the following code to write the value '1.23456789' to my CSV-file, as follows:
csvwrite('filename.csv', [1.23456789])
Upon reading the value back from the file, I see that there is some loss in precision:
val = csvread('filename.csv')
val =
1.2346
When I open the "filename.csv" file, it too contains the rounded-off value.

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Accepted Answer

MathWorks Support Team
MathWorks Support Team on 27 Jun 2009
The CSVWRITE function converts numbers to short format before writing them to the file. To preserve precision, use the DLMWRITE function to explicitly set the precision of the data in the CSV-file:
dlmwrite('filename.csv', [1.23456789], 'delimiter', ',', 'precision', 9);

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