Matlab function won't return matrices as outputs?

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Kevin
Kevin 2013-4-16
I created a function that should return two matrices [roffset, coffset] as outputs, but when I run the function I receive two nx1 vectors. Though, the code works when I copy and paste it into the command window. Why won't it work through the function?
Here's the function:
function [roffset, coffset] = findLowNhbr(map)
r = 1;
c = 1;
% outer loop, going through the rows of the matrix
while c <= size(map,2)
% inner loop, going through the columns of the matrix
while r <= size(map,1)
if r == 1 || c == 1
roffset(r,c) = 0;
coffset(r,c) = 0;
elseif r == size(map,1) || c == size(map,2)
roffset(r,c) = 0;
coffset(r,c) = 0;
else
% determines the offsets
pr = -1:1; pc = -1:1;
% creates a matrix of map(r,c) and its surrounding elements
P = map(r + pr, c + pc);
[or, oc] = find(P == min(P(:)));
roffset(r,c) = or - 2;
coffset(r,c) = oc - 2;
end
r = r + 1;
end
c = c + 1;
r = 1;
end

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回答（1 个）

Matt J
Matt J 2013-4-16
编辑：Matt J 2013-4-16
Possibly because you're passing an nx1 matrix "map" as input. We can't really know what's going on without you specifying how to reproduce what you're seeing. Two remarks, though
  1. It is dangerous to use FIND without checking whether the output is empty or non-scalar.
  2. If you have the image processing toolbox, most of your code, which is just a minimization filter, could be replaced by the single line
imerode(map, ones(3))

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