Find rows with a specific value in their columns

Question

Possible Duplicate:
Find rows in matrix where entries match certain constraints?

In Matlab, i have a matrix (MxN) and I want to find the rows whose entry in a specific column is equal to a specified value. For example, I have a matrix as follow:

   0    0   0   0   0   0   0   0   1   0
   1    0   0   0   0   0   1   0   0   1
   0    0   1   0   0   0   0   0   0   0
   0    0   0   1   0   0   0   0   1   0
   0    0   0   0   1   0   0   0   0   1
   0    0   0   0   0   0   0   0   0   0
   0    1   1   0   0   0   1   0   1   0
   0    0   0   0   0   0   0   0   0   1
   0    0   0   0   0   0   0   0   0   0
   0    0   0   0   0   0   0   0   0   1

I want to find the rows whose 7th element us equal to 1. In this example, the result matrix should contains rows 2 and 7.

Solution

if your matrix is called A, just do:

A(A(:,7)==1,:)

PS: I think that this question has already been answered a million times...

Comments

[Sam]

tnx Oli, I know it was a silly question, but for a moment I was confused with a big matrix! :(

[Sam]

@ Oli: another question: how I should change your code if I want to select a column (or columns) that is/are between for example a and b? I mean, not an exact value, but a range

[Sam]

found it, I used && instead of &!!