How to replace element matrix with the other matrix?
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What if I have a matrix A (4x4) with a size of (1x64 cell), and the matrix B (2x2) with size of (1x64 cell)? And I want to replace all of the matrix A.
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Bjorn Gustavsson
2014년 2월 7일
OK, this doesn't really work if you cant communicate clearly what A and B are. Instead of describing in words, paste the output of
whos A B
and in case A and B are a cell arrays also
size(A{1})
size(B{1})
답변 (6개)
Image Analyst
2014년 2월 7일
OK, so both A and B are 1 by 64 cell arrays. And you say "And I want to replace all of the matrix A." Presumably replace A with B. So you do this:
A = B;
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Image Analyst
2014년 2월 8일
A is NOT 4 by 4. It is 1 by 64. You don't understand the concept of cell arrays. I really really suggest you read the FAQ on it: http://matlab.wikia.com/wiki/FAQ#What_is_a_cell_array.3F
Plus, you and I must have different definitions of "all". To me, your "all" means a subset (2x2 out of 4x4).
Bjorn Gustavsson
2014년 2월 7일
OK, then I suggest that (unless you definitely need the cell-array A as a cell-array) you first change A and B to 3-D matrices and put in B in A:
A = cat(3,A{:});
B = cat(3,B{:});
A(2:3,2:3,:) = B;
HTH.
댓글 수: 2
Bjorn Gustavsson
2014년 2월 8일
Well, are you sure that B is a cell array at the time you call cat and you have the same sized (2 x 2) arrays in all cells of B?
The solution I suggested works in matlab 2013a...
Jos (10584)
2014년 2월 7일
I suggest that you give a smaller example of A and B and the required output.
댓글 수: 3
Jos (10584)
2014년 2월 8일
So you want the central portion of B to be replaced with A.
What do you mean with "I have 64 pieces of both that matrix"?
Bjorn Gustavsson
2014년 2월 8일
Well that's completely opposite of your initial description of the sizes...
B(2:3,2:3) = A;
Would be what you'd do for that. For the case that B is 3-D you'd modify it to:
B(2:3,2:3,:) = A;
Walter Roberson
2014년 2월 8일
newA = cellfun(@(a,b) subsasgn(a, struct('type', '()', 'subs', {2:3, 2:3}), b), A, B, 'Uniform', 0);
I think.
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Walter Roberson
2014년 2월 8일
newA = cellfun(@(a) subsasgn(a, struct('type', '()', 'subs', {2:3, 2:3}), B), A, 'Uniform', 0);
Jos (10584)
2014년 2월 8일
To replace the central portion of B with A try this
% example data
A = 2 * ones(2,2)
B = -3 * ones(6,8)
% engine
szA = size(A)
szB = size(B)
tf = false(szB)
tf(1:szA(1),1:szA(2)) = true
tf = circshift(tf,(szB-szA)/2)
B_output = B
B_output(tf) = A
댓글 수: 0
Jos (10584)
2014년 2월 8일
Even simpler:
% example data
A = 99 * ones(2,2)
B = -1 * ones(6,8)
% engine
szA = size(A)
i0 = (size(B)-szA)/2
B_output = B ;
B_output(i0(1)+1:i0(1)+szA(1), i0(2)+1:i0(2)+szA(2)) = A
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