Why does this while loop acts like an infinite loop

Il am trying to change the elements of m to 0 when they reach a value superior to 10. The sequence is suppose to stop when all the elements equal 0 but it seem to act like an infinite loop when it should take less than 10 iterations to solve and I don't know why. What is the problem and how can I solve it?

clear;clc
m=[1,2,3,4,5];
l=length(m);
z=0;
while l~=z
  m=m*1.5;
  a=find(m>=10);
  la=length(a);
  if la>0
      m(a)=0;
  end
  z=la;
end
  a=m

Answer 1

[Matt J]

Once you start replacing some of the m(i) with zeros, those m(i) remain zero and can never again reach a value of 10. Therefore z=sum(m>=10) can never reach l=length(m). You really want something like this,

while any(m)
  m=m*1.5;
  m(m>=10)=0;
end

Answer 2

[Sean de Wolski]

Put a break point on the first line and then step through. You can out a breakpoint by clicking on the dash next to the while. Then click step to walk through each line investigating what each variable is at any point.