multidimensional matrix with different sizes

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ecresna - 17 Jul 2008 11:52 GMT

Hi all.

It could be possible to fill a 4D matrix with different 3D matrices?????

I'm trying to fill a 4D matrix with some 512x512xN matrices where N can be 4,
8 or 16.

/ 512x512x8 512x512x4 \

| |

\ 512x512x8 512x512x16 /

Next I need to send it to a C mex file but my mex file can just detect the
upper level (if I have a group of 4 512x512xN matrices, my Cmex file just
will detect a 2x2 matrix)

What can I do?
Thanks in advance.

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John D'Errico - 17 Jul 2008 12:14 GMT

"ecresna via MathKB.com" <u41514@uwe> wrote in message
<874757abd8eab@uwe>...

> Hi all.
>
[quoted text clipped - 12 lines]
>
> What can I do?

help cell

John

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ecresna - 17 Jul 2008 13:16 GMT

Fine.

Thanks John. But I have yet a cell like this:

/ 512x512x8 512x512x4 \

| |

\ 512x512x8 512x512x16 /

My problem is I want to send it to a Cmex program which just can
"read/detect" the first level (2x2 matrix) and I cannot put these all
matrices in a big one (by using cell2mat )because of dimensions.

Thanks.

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Peter Boettcher - 17 Jul 2008 17:35 GMT

> Fine.
>
[quoted text clipped - 8 lines]
> "read/detect" the first level (2x2 matrix) and I cannot put these all
> matrices in a big one (by using cell2mat )because of dimensions.

You need to write your MEX code to expect a cell array, and pull out the
pointers to the other matrices underneath. See the MEX documentation
for cell arrays.

-Peter

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ecresna - 18 Jul 2008 07:43 GMT

>> Fine.
>>
[quoted text clipped - 7 lines]
>
>-Peter

Thank you!!!

I hope I shouldn't modify my mex code and just changing some matlab code I
could get these matrices, but.....

Well, thank you very much!!!

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Math Forum / Math Software / MATLAB / July 2008

multidimensional matrix with different sizes