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Large matrix handling

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Hi,

  I need to deal with a very large matrix in Matlab, i.e. image(21600, 43200). With a floating point type, this matrix will take more than 3 GB memory. With a 64-bit machine and OS, this amount of memory can be allocated. But Matlab seems not be able to allocate that much of memory automatically. Does anybody have successful experience with similar situation?

Thanks in advance.

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