Adding entry to a matrix loop

I have a matix, A, of 100x200 zeros. I will be taking data from an oscilloscope that will continually be written to a matrix, B, 1X1. I want to write a loop that inputs B into the spot 1,1 of A. Then after the oscilloscope has taken new data and rewritten B, input it into spot 1,2. When the first line is complete I want the data to go into 2,1 and so on till A is full up. How might I write this loop?

[John D'Errico]

Why pray tell, do you want to write data into a matrix along those diagonals? Where does the 4th element go?

Answer 1

[John Chilleri]

Hello,

You can fill in your matrix by rows with this:

for i = 1:100
   for j = 1:200
      % Acquire your B
      A(i,j) = B;
   end
end

Hope this helps!

[Jacob Hollebon]

Very helpful, thanks!

[Jacob Hollebon]

When I try and run this now, I get the error 'Attempted to access A(0,0); index must be a positive integer or logical.'

I have tried formatting A as

A = zeros (100,200,'double')

as B is variable type double. But still get the same error.

[John Chilleri]

Your loop goes from i=1:100 and j=1:200 correct? Not 0:100 and 0:200? This error occurs when you try to access A(0,0) which does not exist.