What does the matlab code in steps 2 and 3 mean?
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1.Hphi=Heaviside(phi,epsilon);
2.M(:,:,1)=Hphi;
3.M(:,:,2)=1-Hphi;
4.N_class=size(M,3);
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Answers (1)
Wayne King
on 29 Jul 2012
Edited: Wayne King
on 29 Jul 2012
M is a 3-D matrix.
M(:,:,1) = Hphi;
Means set the first "page" of the 3rd dimension equal to the output of Heaviside with inputs phi and epsilon, which here is Hphi.
M(:,:,2) = 1-Hphi;
Means set the second "page" of the 3rd dimension equal to 1-Hphi.
In general, M(:,:,index) is the way of assigning all rows and all columns of the index-th page of a 3D matrix a given value.
For example:
M = zeros(2,2,2); % M is 2x2x2
M(:,:,1) = 1;
M(:,:,2) = 2;
Now M(:,:,1) is a 2x2 matrix of ones and M(:,:,2) is a 2x2 matrix of 2s.
N_class = size(M,3);
Is just returning the size of M in the 3rd dimension
M = ones(2,2,4);
size(M,3)
Are you trying to read the Matlab documentation?
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