Randomizing the picking and changing of values in a 3D array

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I have a 24x365x60 array and would like to set 4 of the 24 values for each of the 365 columns to a constant (11), based on a 24x365 matrix with "1"s in the particular positions, for a randomized 30 of the 60 sheets (third dimemsion) and letting the other 30 beeing unchanged. What is the best way to solve this?

Accepted Answer

Jan on 16 Aug 2022
Edited: Jan on 17 Aug 2022
x = zeros(24, 365, 60);
m3 = randperm(60, 30);
for i3 = m3
for i2 = 1:365
m1 = randperm(24, 4);
x(m1, i2, i3) = 11;
sum(x(:) == 11)
ans = 43800
Is this the wanted number of 11's? 4*365*30 = 43800
Filip Hansson
Filip Hansson on 18 Aug 2022
I saw the solution from you in another tread and it worked lika a charm!

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