Linear combination of cell arrays

Question

Dan Ryan 2013-1-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/59917-linear-combination-of-cell-arrays

Is there a compact way (without loops) to take linear combinations of cell arrays that contain the same type of data (matrices of various sizes) in each index of the cell array?

For example:

A = {rand(2, 2), ones(1, 2)}
B = {rand(2, 2), [3, 4]}

and I want a cell array, C, such that

C = 3*A + 4*B

I want to be able to handle a cell array of arbitrary length. I can do this with a for loop, but I was thinking that there must be a better way.

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Answer 1

Peter Perkins 2013-1-25

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https://ww2.mathworks.cn/matlabcentral/answers/59917-linear-combination-of-cell-arrays#answer_72445

在 MATLAB Online 中打开

Either of these will work:

>> A = {rand(2, 2), ones(1, 2)}
>> B = {rand(2, 2), [3, 4]}
>> cellfun(@(a,b) 3*a + 4*b, A, B, 'UniformOutput',false)
ans = 
    [2x2 double]    [1x2 double]
>> arrayfun(@(a,b) {3*a{:} + 4*b{:}}, A, B)
ans = 
    [2x2 double]    [1x2 double]