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

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?

Answer 1

[Walter Roberson]

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.

[Image Analyst]

See memmapfile().

[vx2008]

thanks a lot! I now try to use "dlmwrite/dlmread' and it is ok; thanks everyone.

Answer 2

[Image Analyst]

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'.