gather elements of a cell

Question

kix 2020-7-10

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https://ww2.mathworks.cn/matlabcentral/answers/563045-gather-elements-of-a-cell

回答： Image Analyst 2020-7-10

Hi everyone!

I have got a cell that is containing array and I would like to create a new array with the elements of this cell.

For example, I’ve got a cell like this one: A={[1 2 3] [4 5 6 7 8] [9 10]}

So if I want my new cell to have 5 elements, I would take the first three element of the in the 1st array and then I would pick randomly 2 elements in the second array to complete.

And my result would be like: B =[1 2 3 7 5]

Functions like cat and cell2mat would give me the 5 elements but I’m struggling with the random part.

Thanks in advance

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Answer 1

Image Analyst 2020-7-10

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https://ww2.mathworks.cn/matlabcentral/answers/563045-gather-elements-of-a-cell#answer_464255

在 MATLAB Online 中打开

First of all, you do not have a cell that contains an array.

You have a cell array with 3 cells, each of which has a single row vector in it.

I think your confusion lies in not having read the FAQ on cell arrays, so please read it.

Anyway, here is code to do what you asked.

% Define the cell array A, which has 3 cells.
A={[1 2 3] [4 5 6 7 8] [9 10]}
% Get two random indexes in the second cell
randomIndexes = randperm(length(A{2}), 2) 
% Get two elements from the contents of the vector in the second cell using randperm().
twoElements = A{2}(randomIndexes) 
% Now concatenate them into a single row vector of class double.
B = [A{1}, twoElements]