On define a large scale arrays

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C Zeng
C Zeng 2013-1-6
Hi, all, I want to define and store a large scale arrays, like ones(3^N,1000,N) and N can be 15. However, matlab says it is out of memory, because of the large scale.
I wonder is there any way to resolve it? I mean, to fulfill the purpose but satisfy the requirement of matlab? Actually ones(3^N, 1000,1) is still very large scale.
Thanks.

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Image Analyst
Image Analyst 2013-1-6
Does it need to be double? Can it be single, uint8, or logical instead? Will it have any values other than 1 or small integers?
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Image Analyst
Image Analyst 2013-1-6
Are you sure that you need to whole matrix in memory at one time? Can't you work in "chunks"? Like work on a smaller cube of it at a time? Will you eventually access each and every one of those elements? Or can you use "sparse" matrices? Have you read the Mathworks guidance on this issue: Memory Usage
C Zeng
C Zeng 2013-1-6
I may not need all matrix at a time and yes I can work in chunks. Let me double check the problem. Thank you for your suggestion!

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Matt J
Matt J 2013-1-6
编辑：Matt J 2013-1-6
Are the entries mostly zeros? Could you use the SPARSE command?
If you need to work with n-dimensional sparse arrays, there is this:
http://www.mathworks.com/matlabcentral/fileexchange/29832-n-dimensional-sparse-arrays
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Matt J
Matt J 2013-1-6
If they are mostly ones, you can express the array as
1 + sparse_array
and rewrite your computations in terms of that.
C Zeng
C Zeng 2013-1-6
Yes, could be helpful, let me find it out. Thanks.

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