How to convert a cell array to a compatible matrix?

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Nandha Kumar
Nandha Kumar am 16 Jul. 2021
Kommentiert: Nandha Kumar am 17 Jul. 2021
I have a cell array which is filled with matrices of varying size, could you help me to convert it to matrix with filling zeros at in between columns,
in this case the matrix size is ought ot be 41x 41 of double type.
  1 Kommentar
KSSV
KSSV am 16 Jul. 2021
Fill the empty cells with appropriate zero matrices and use Cell2mat.

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Jan
Jan am 16 Jul. 2021
Bearbeitet: Jan am 16 Jul. 2021
CC = {rand(9,9), rand(5,4), rand(5,4), rand(6,4), rand(6,4), rand(8,4), rand(8,4), rand(9,4), rand(9, 4); ...
rand(4,5), rand(4,4), [], [], [], [], [], [], []; ...
[], [], rand(4,4), [], [], [], [], [], []; ...
rand(4,6), [], [], rand(4,4), [], [], [], [], []; ...
[], [], [], [], rand(4,4), [], [], [], []; ...
rand(4,6), [], [], [], [], rand(4,4), [], [], []; ...
[], [], [], [], [], [], rand(4,4), [], []; ...
rand(4,6), [], [], [], [], [], [], rand(4,4), []; ...
[], [], [], [], [], [], [], [], rand(4,4)};
C = CC;
S1 = cellfun('size', C, 1);
maxS1 = max(S1, [], 2);
S2 = cellfun('size', C, 2);
maxS2 = max(S2, [], 1);
for i2 = 1:size(C, 2)
for i1 = 1:size(C, 1)
X = C{i1, i2};
if size(X, 1) < maxS1(i1) || size(X, 2) < maxS2(i2)
X(maxS1(i1), maxS2(i2)) = 0;
C{i1, i2} = X;
end
end
end
Result = cell2mat(C);
Cheaper:
C = CC;
S1 = cellfun('size', C, 1);
maxS1 = max(S1, [], 2);
S2 = cellfun('size', C, 2);
maxS2 = max(S2, [], 1);
Result2 = zeros(sum(maxS1), sum(maxS2));
c1 = 1;
for i1 = 1:size(C, 1)
c2 = 1;
for i2 = 1:size(C, 2)
X = C{i1, i2};
Result2(c1:c1 + size(X,1) - 1, c2:c2 + size(X,2) - 1) = X;
c2 = c2 + maxS2(i2);
end
c1 = c1 + maxS1(i1);
end
isequal(Result, Result2)
ans = logical
1
It took some tome to create some test data as input. Please care for providing some code, which creates your input data, to make answering as easy as possible.
  3 Kommentare
Nandha Kumar
Nandha Kumar am 17 Jul. 2021
@Image Analyst Thank you sir, I ll learn from it.

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