Binary mask operation: vector into nonzero part of mask in 1 statement?

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Jurgen
Jurgen 2012-12-11
I have a logical matrix MASK and a vector VEC with real numbers (uint8 mostly). nnz(MASK) equals length(VEC).
I create a new matrix NEW where the logical 1's in MASK are replaced by the values in VEC--in sequential order:
NEW = MASK;
NEW(NEW>0) = VEC;
Can I do this with 1 statement? Because in practice I want to replace NEW with VEC since I dont need VEC anymore after the operation, and don't want to pile up variables. MASK should remain untouched.
Thanks

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回答（1 个）

Image Analyst
Image Analyst 2012-12-11
I think you can just do:
VEC(~MASK) = 0;
I think this will do the same thing - set VEC to zero where MASK is false, and VEC stays VEC where MASK is true.
By the way, you can use clear('variableName') to get rid of variables you don't need anymore.
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Image Analyst
Image Analyst 2012-12-12
编辑：Image Analyst 2012-12-12
It looks like in your code demo that vec will need to get resized, so no, there's no way to do it in a single assignment. Use clear('VEC') to get rid of VEC after you've created NEW.
Jurgen
Jurgen 2012-12-12
Thanks, in the end I just made a function that takes the mask and vector and spits out a substituted image. If you cant beat em, join em :)

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