How to Overwrite Data

The main objective is to overwrite the maximum values in matrix B with the values collected in matrix A

So I have:

A = (1:100,1) % A is the matrix with the results I need. So, A(1,1) = 4 , A(6,1) = 9

B = (1:100,1:2) % B always contains on each row a 0 and a value. Such as B(1,1:2) = 0 2 , B(6,1:2) = 53 0.

% Result would be for:

% C = (1:100,1:2) you would get C(1,1:2) = 0 4 , C(6,1:2) = 9 0

[madhan ravi]

not clear , illustrate with a short example

[Stephen23]

@Nikolaos Zafirakis: whatever you do, do NOT use loops for this! Using loops would be a waste of MATLAB's efficient code vectorization abilities:

https://www.mathworks.com/help/matlab/matlab_prog/vectorization.html

Answer 1

[Stephen23]

One simple MATLAB way:

C = max(A,B).*(B~=0)

Or for MATLAB versions prior to R2016b:

C = bsxfun(@max,A,B).*(B~=0)

Answer 2

[Abhishek Kumar]

for i= 1:100
   if B(i, 1) == 0
       B(i, 1)= A(i, 1);
   elseif B(i, 2) == 0 
       B(i, 2) = A(i, 1);
   end
end

The above bit of code should give you the desired output

Answer 3

[Shameer Parmar]

Here you go..

A = [1; 5; 7; 9; 4; 6; 8; 2; 3];
B = [4 0; 5 6; 8 0; 7 5; 0 8; 4 9; 5 6; 0 1; 2 8];
C = B;

for i = 1:length(B)
    if B(i,1) == 0
       C(i,2)= A(i,1);
    elseif B(i,2) == 0
       C(i,1)= A(i,1);
    end
end