omitting array

hi, i'm a beginner and now i'm writing a program, but there is a problem. i have a 13*1 matrix, but i want just the odd rows, it means 1, 3, 5, 7, 9, 11, and 13. how can i omit the even rows? i want a rule so that i can use it for other long matrixes! please help :D

Answer 1

[Laura Proctor]

If your matrix is called m, you can reference the odd rows like this:

m(1:2:end,:)

If it is always going to be a vector (an nx1 or 1xn matrix), then you can use linear indexing and this reference:

m(1:2:end)

If you want to overwrite your vector, just reassign it to the original variable name:

m = m(1:2:end)

[Anahita Gh]

tnx :)

Answer 2

[Oleg Komarov]

I suggest you to read the chapter "Matrices and Arrays" from the Getting Started guide.

For matrix A:

A(1:3:end,:)

[Anahita Gh]

tnx :)