Multiply each column by a elements of cell array

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lucksBi
lucksBi 2017-6-13
评论： lucksBi 2017-6-13
hey
i have a matrix like this:
matrix=
0 2 4
3 0 0
0 1 0
3 0 1
0 0 0
and cell array: mul={1,1,0.6,0.6,0.3}
i want to multiply all columns by 'mul' and then add. e.g. [0x1 + 3x1 + 0x0.6 + 3x0.6 + 0x0.3] and same for all other columns.
Thanks

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采纳的回答

KSSV
KSSV 2017-6-13
matrix=[0 2 4
3 0 0
0 1 0
3 0 1
0 0 0];
mul={1,1,0.6,0.6,0.3} ;
iwant = sum(bsxfun(@times,matrix,[mul{:}]'))
  2 个评论
lucksBi
lucksBi 2017-6-13
编辑：lucksBi 2017-6-13
Thanks alot. Will it be same if matrix is a cell array instead of 2D?
KSSV
KSSV 2017-6-13
No...it is better to work with matrices. I suggest to convert your mul to matrix.

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更多回答（2 个）

Guillaume
Guillaume 2017-6-13
Conceptually it would make a lot more sense for your cell array to be a column rather than a row.
Anyway, the easiest way to do what you want is to convert your cell array into a column vector. It is then trivial to multiply it with the matrix:
result = sum(matrix .* cell2mat(mul')); %requires R2016b or later
%in <R2016b: result = sum(bsxfun(@times, matrix, cell2mat(mul')));
  1 个评论
lucksBi
lucksBi 2017-6-13
Yes Thanks alot for suggestion but it was kind of requirement. Thanks for your time.

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Andrei Bobrov
Andrei Bobrov 2017-6-13
result = matrix.'*cat(1,mul{:});
or
result = [mul{:}]*matrix;

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