xlswrite precision problem
3 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
Hi!
I have a huge amount of data in array (60000x17) with precision of 3 decimal places. After some operations I would like to save that array in excel file by using xlswrite command. The problem is that whenever I do that the excel file become where huge because all the numbers are stored as double (15 decimal places).
So my question is how can you store an array with only 3 decimal places by using xlswrite command?
I also tried to transform numbers into single before saving but it didn't work.
thank you in advance!
0 Commenti
Risposta accettata
Ken Atwell
il 17 Feb 2012
xlswrite does not provide this option itself.
You could do the rounding in MATLAB before committing to file:
A=rand(3)
xlswrite('foo.xlsx', round(A*1e3)/1e3);
This should mostly work, but I suppose there may be cases where an exported value can be ?.???99999999999999 or some such. There may be a better numerical way to do this kind of round, but I don't know what it might be.
0 Commenti
Più risposte (1)
Image Analyst
il 17 Feb 2012
That's only 1,020,000 elements. Hardly huge at all. Even with double precision (8 bytes per number), your file is only about 8 megabytes, right? That's not even as big as a run of the mill point and shoot camera image. Why do you need to make this tiny file even smaller? What kind of file sizes are you getting from Excel?
Vedere anche
Categorie
Scopri di più su Data Import from MATLAB in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!