remove the rows of matrix?

I want to remove the rows of matrix that the value of them in first column is zero...I use this code:

if true
 for i=1:7
if m(i)==0
m(i,:)=[];
i=i-1;
end
end
end

I run this code for this matrix but the answer is not true,it could not remove all rows that the first column of them is zero..

if true
  >> m=[1 2;3 4;0 5;3 0;0 4;0 54;3 22]

m =

     1     2
     3     4
     0     5
     3     0
     0     4
     0    54
     3    22

if true
  >> for i=1:7
if m(i)==0
m(i,:)=[];
i=i-1;
end
end
end

but when we saw the result,the result is: >> m

m =

     1     2
     3     4
     3     0
     0    54
     3    22
  end

is my cod wrong?

Answer 1

[Azzi Abdelmalek]

m=[1 2;3 4;0 5;3 0;0 4;0 54;3 22]
m(~m(:,1),:)=[]

[jack nn]

thanks