Making a for-loop based on a condition for the third dimension of a 3D Array

I would like to include "a3" as a condition in the for-loop but cant get it to work. The final form of "AllaMatriser" should be a 24x365x60 where the change from the actuall for-loop should have affact only 30 out of the 60 sheets, where the other 30 would be left unchanged.

Thanks in advanced!

AntalObjekt = 60;                  
Procent = 0.5;                        
AntalLadd = fix(AntalObjekt*Procent); 
i =11;

b3 = 1:AntalObjekt;
a3 = randsample(b3, AntalLadd);

for i = i
        AllaMatriser(m_spotpris==1) = i; % Both AllaMatriser and m_spotpris are 24x365x60 matrices
end

Answer 1

[Jan]

Omit strange useless lines like "for i = i".

AntalObjekt = 60;                  
Procent     = 0.5;                        
AntalLadd   = fix(AntalObjekt*Procent); 

i  = 11;
a3 = randparm(AntalObjekt, AntalLadd);

match = false(size(m_spotpris));
match(:, :, a3) = (m_spotpris(:, :, a3) == 1);

AllaMatriser(match) = i;

Or use the loop I've provided for the same question here already: https://www.mathworks.com/matlabcentral/answers/1780105-randomizing-the-picking-and-changing-of-values-in-a-3d-array

[Filip Hansson]

This was excatly what I was looking for!!! Thank you so much!