Multiply a cell array with a scalar

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Patrik Ek
Patrik Ek 2014-2-10
编辑： swenia 2020-2-4
Hi, I have a cell array that contain a number of different sized matrices. I need to multiply each of these cell elements, where the number of cells is not constant, with a single scalar value. Does anyone know how to do this? It does not work with the standard call of cellfun since the cells are of different size,
cellfun(@times,a,{2})
The reason is that I use matlab as an interface to create stuff to another program and I depending on what item I create I need to use different tones on the colormaps.

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Azzi Abdelmalek
Azzi Abdelmalek 2014-2-10
编辑：Azzi Abdelmalek 2014-2-10
yournumber=2;
a={[1 2 3],[2 5;6 8], [2 5 8 7]}
cellfun(@(x) x*yournumber,a,'un',0)
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Andrew Bliss
Andrew Bliss 2016-8-4
编辑：Andrew Bliss 2016-8-4
'un',0 is a shorthand way of writing 'UniformOutput',false See the help for what that means - in essence it will make cellfun output a cell rather than an array.
swenia
swenia 2020-2-4
编辑：swenia 2020-2-4
This is very helpful, thanks. Follow-up question: what if I'd like to multiply each cell element with a different number stored in a vector?
For instance:
a = {[1 2; 3 4], [5 6; 7 8]}
b = [0;1]
I'd like to multiply a and b such that the result will be:
ans = {[0 0; 0 0], [5 6; 7 8]}
Edit: Nvm, I found the answer here: https://www.mathworks.com/matlabcentral/answers/476131-how-to-multiply-each-element-of-a-cell-array-by-a-different-scalar

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