MATLAB: Finding nth elements in multiple arrays

cell arrayselementsplot

I have multiple cell arrays: [93×2 double] [216×2 double] [128×2 double][121×2 double] [ 90×2 double] …so on. These correspond to XY plots,

plot(a{i}(:,1),a{i}(:,2))

opens a plot which looks as fig attached. I want to get the Y values at 1/4th, 1/2 and 3/4th of X for all cells. How can I go about doing this?

Thanks

Best Answer

Presuming Y is in the second column and that you want the 1/4 by position instead of by range:

cellfun( @(C) C(round([end/4, end/2, 3*end/4]), 2), YourCell, 'Uniform', 0)

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MATLAB: How to replace half the number of specific element in an array

To change random columns:

>> A=[1 2 3 4 4 1 2 4 4 3 4 4 4 2 1 3 4 4 4 2 1 4 4]
A =
   1   2   3   4   4   1   2   4   4   3   4   4   4   2   1   3   4   4   4   2   1   4   4
>> nnz(A==4)
ans =  12
>> idx = find(A==4);
>> num = numel(idx);
>> A(idx(randperm(num,ceil(num/2)))) = 2
A =
   1   2   3   2   2   1   2   4   4   3   2   4   2   2   1   3   2   4   4   2   1   2   4
>> nnz(A==4)
ans =  6

Best Answer

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