delete rows of a matrix

I have a vector

A = [ 1 0 2;
      0 3 4; 
      3 5 0;
      0 0 0;
      1 1 1 ]

I need to delete the rows with ALL ELEMeTNS = 0 that means I want to get

B = [ 1 0 2;
      0 3 4; 
      3 5 0;
      1 1 1 ] form A.

Can someone please help me with this? I have to use this command inside a LOOP. So, I don't know in which row this could happen.

So, I need a code that finds and deletes the rows with all elements equal to zero.

Thanks.

Answer 1

[Walter Roberson]

~any(A(J,:)) when you are examining row J.

[dav]

Thank you very much!

Answer 2

[Image Analyst]

Once you graduate to the more MATLAB-ish, non-loop, vectorized way, you'd do it like this:

clc;
A = [ 1 0 2;
      0 3 4; 
      3 5 0;
      0 0 0;
      1 1 1 ]  
rowsToKeep = any(A,2)
B = A(rowsToKeep, :)

Why do you have to do it in a loop? Seems like a dumb requirement.

[dav]

I have to employ this in a simulation program. thanks.

[Image Analyst]

You can employ my code in a simulation program. Being in a simulation program is not a reason why it has to be a for loop. But whatever...it doesn't matter....