how shall I read/write/add-write big data in MatLab?

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vx2008
vx2008 on 1 Jan 2017
Commented: vx2008 on 2 Jan 2017
I set big data in variable X and Now I want to save it on my hard disk;
I use "save output X", and get warning: "out of memory";
I use "xlswrite('output.xlsx',X)", and get warnning: it is too big for this format;
Now how shall I write this big data and especially what if I want to add other data for other code into the "output" and how shall I read it out if it is too big?

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Answers (2)

Walter Roberson
Walter Roberson on 1 Jan 2017
If it is a numeric array, you could fwrite() it as a binary file.
For non-numeric items sometimes using memory mapping is appropriate.
You might be able to use the matFile interface to save part of it at a time.
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vx2008
vx2008 on 2 Jan 2017
thanks a lot! I now try to use "dlmwrite/dlmread' and it is ok; thanks everyone.

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Image Analyst
Image Analyst on 1 Jan 2017
One option is to split the workbook up into smaller workbooks, if there is anyway that makes sense, otherwise just arbitrarily at rows like 'firstHalf.xlsx' and 'secondHalf.xlsx'.

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