How can I get a vector out of a matrix?

Given a two dimension matrix, if I want to extract 3 elements with subsript (1,2) (2,4) (3,6) to form a vector, how I can I achieve that without using a double loop? Because if I just use M(1:3,2:2:6), the result will also be a matrix. Can someone give me a simple solution?

[KALYAN ACHARJYA]

First convert Matrix to vector

%
 vector=matrix(:);
 %Do the Operation  
 result=[vector(1,2),vector(2,4),vector(1,2),vector(3,6)]
%

[Stephen Cobeldick]

@KALYAN ACHARJYA: a column vector has no columns 2, 4, or 6.

One good way is to use sub2ind, as José-Luis has already answered.

Answer 1

[José-Luis]

Sounds like a job for sub2ind()