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Matrix dimension must agree to use .*

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Neo
Neo 2015-12-31
评论： Star Strider 2016-1-4
I debugged my code and checked my workspace variables, and when I loaded in the two images their numbers were identical (matrix dimensions, their matrix dimensions after I manipulated them) yet when I use .* it still says an error because .* requires identical matrix dimensions, when, Q.E.D., that's what I have! Suggestions?
Cheers,
Neo Cornel

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Star Strider
Star Strider 2015-12-31
Without knowing what the images are and seeing your code, it’s difficult to determine the problem. That they’re images means that they could have three dimensions (the third being the colour channels in a RGB image), and if one is a grayscale image having two dimensions, you could get that error even if they have the same number of rows and columns.
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Image Analyst
Image Analyst 2016-1-4
If you wanted to make copies of something. Like if you manually made up a 2-by-2 checkerboard and you wanted to replicate it to be a 8-by-8 checkerboard for example.
Star Strider
Star Strider 2016-1-4
... or for a number of other reasons, for instance if you are using textscan and want to replicate a format descriptor without typing out each one, use repmat('%f',1,10) to replicate ‘%f’ 10 times.
It’s highly useful, although if you’re operating on a matrix with a vector element-wise, bsxfun is usually faster.

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