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Concatenating columns from a for loop.

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Shaun
Shaun 2015-2-17
编辑： Shaun 2015-2-20
Hi, So I have some code that creates a column of data in each run of a for loop. I want to concatenate those columns to build an array once the for loop has finished. So far I have....
vals = cell(size(images, 3), 2);
T2ind = cell(size(images, 1), 1);
T2 = cell(size(images, 1), size(images, 2));
for y = 1:size(images,1)
for x = 1:size(images,2)
if ((sum(images(y,x,:))/size(images, 3)) > 100)
for z = 1:size(images, 3)
echo = dat(z, 6);
imgVal = images(y,x,z);
vals(z,:) = {echo, imgVal};
end
f = fit(cell2mat(cellfun(@cell2mat, vals(:,1), 'UniformOutput', false)), cell2mat(vals(:,2)), 'exp1');
coeff = coeffvalues(f);
a= coeff(1);
b = coeff(2);
S1 = f(10);
S2 = S1/exp(1);
T2ind{x} = {((log(S2/a))/b)};
end
end
T2(y,:) = cat(1, T2ind{:});
end
The idea being that T2 will be my array of 256 by 256 data points constructed from the 256 T2ind columns. I get a subscripted assignment dimension mismatch error for T2. Any help would be great! Thanks!
Error:
Subscripted assignment dimension mismatch.
Error in T2_mapping (line 60)
T2(y, :) = cat(1, T2ind{:});

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回答（1 个）

Jan
Jan 2015-2-17
Please post a complete copy of the error message in every case. Thanks.
T2(y,:) = cat(1, T2ind{:});
The right hand side is a row vector, the left hand side a column vector. Are you sure you want to apply CAT here?
  1 个评论
Shaun
Shaun 2015-2-17
I've added the error code. So I want a set of columns (T2ind) to be concatenated into an array (T2). So,
T2(y,:) = cat(2, T2ind{:});
would be better? I tried that and got the same error. not sure if that's what you mean.

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