Is there a function to sum matrix elements along an arbitrary direction?

Jan
2013 3 12
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Hi
I would like to know if there is a Matlab build-in function that calculates the sum of elements along a direction that is not vertical or horizontal.
Something like output_matrix=sumdir(input_matrix, phi, length)
I couldn't find anything on the matlab help so I would appreciate your help.
Thanks a lot
Jan

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Matt J
Matt J 2013-3-12
编辑：Matt J 2013-3-12

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The RADON function, if you have the Image Processing Toolbox.

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Jan
Jan 2013-3-12
I thought of this function but is says that:
"The Radon transform is the projection of the image intensity along a radial line oriented at a specific angle."
I don't want to make a projection of the whole image, I just want to sum along one direction
Jan
Jan 2013-3-12
And decide of the length of the summation
Jan
Jan 2013-3-12
Sorry for my two previous messages I see how I can make it work with the radon function.
Thanks a lot

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