MATLAB: How to replace zeros in a matrix by the elements of an array

replace

Hi everybody! I have a matrix (A) that contains zeros but it may contain also ones.
    R=1:8;     A=[1 0 0 0;
                  0 0 0 0; 
                  1 0 1 1]
How to replace all the ones by zeros and all the zeros by elements of an array (R) going column-wise so that the resulting matrix (B) would look like:
               B=[0 2 5 7;
                  1 3 6 8;
                  0 4 0 0]

Best Answer

You are on the right track, though it can be done in much simpler way but since you are a beginner this will suffice..
use
Your input matrix was zeros, just add a count for R values
Editing your code:
A=[1 0 0 0;
                  0 0 0 0; 
                  1 0 1 1]  
D=3;
N=4;
% A=zeros(D,N);
equations=sum(A(:)==0);
R=1:equations;
count=1;
for j=1:N
for i=1:D
if A(i,j)==1
A(i,j)=0;
else
ID(i,j)=R(count);
count=count+1;
end
end
end 
ID
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