MATLAB: How to fill cell array with random numbers without for loop

cellcellfunrandom

I have created a cell array:

startSeedsX=cell(1,20);

Now I want each cell to have random number in the range 0 – 100:

startSeedsX=cellfun(@rand*100,startSeedsX);

Brings me error: Undefined operator '*' for input arguments of type 'function_handle'

I tried to put rand*100 in brackets (rand*100) or leave rand alone, doesn't help.

Is there a way to avoid for loop in that case?

Best Answer

Your definition of the function is incorrect. To fill a cell array with random numbers:

startSeedsX=arrayfun@(@() rand*100, 1:20, 'un', 0)

However, since each cell holds a single value, a regular array would be much more convenient:

startSeedsX = rand(1,20)*100

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MATLAB: Create a 3×3 cell array with random numbers

I guess you don't mean scalar numerics, but rather numeric arrays of arbitrary size. I answered in a previous question of yours that you should consider working more with numeric arrays... these can be converted easily to cell arrays later.

For this question, as I also answered previously, one possibility is to create your numeric array and then use mat2cell to convert this into a cell array of numeric arrays. Something like this:

mat2cell(randi(50,20,10),[2,6,12],10)

In your example your three randi calls are over different ranges. Note that there is no possibility to create one numeric array using just one call to randi but with different ranges.

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a={rand(7,2)  rand(7,2)  rand(7,2)}  % This is an example
b=sum(cat(3,a{:}),3)

Best Answer

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MATLAB: Create a 3×3 cell array with random numbers

MATLAB: Summing all the Matrices in a Cell Array

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