You can do this pretty easily with some indexing. Here's an example with some random data:
m = [rand(10,2) randi(2,10,1)-1]
m0 = m(m(:,3)==0,:) % read the right hand side as: from m, take the rows where the third column of m is 0, take all columns
m1 = m(m(:,3)==1,:) % read the right hand side as: from m, take the rows where the third column of m is 1, take all columns
To understand how this works, you can look at what you're feeding in:
ind = m(:,3)==1
(importantly it's displayed as 1 and 0, but note it's a "logical array" it's really true, false, false, false, true, ...)
