remove rows with all zeros

I have

 a =
     1     2     3
     0     0     0
     2     1     0
     4     5     0
     0     0     0
     2     0     1

I need

 b=

     1     2     3
     2     1     0
     4     5     0
     2     0     1

Answer 1

[Walter Roberson]

b = a(any(a,2),:);

[Rahul]

thanks Walter

[Brodie Norfolk]

walter cheers mate

[Walter Roberson]

Note: the above code treats nan values the same as zero values, so for example the row [0 nan nan] would also be removed. If that is not acceptable, then

b = a(any(a ~= 0,2),:);

[Mohamed Nedal]

Hi Walter,

Would you please explain this line?

b = a(any(a,2),:); 

[Shishir Bapat]

Thank you

Answer 2

[Geoff]

Search facility on Answers shows this question is asked a lot... Here's one of the more recent.

http://www.mathworks.com/matlabcentral/answers/40018-delete-zeros-rows-and-columns