omitting array

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Anahita Gh
Anahita Gh 2012-2-16
编辑： Jan 2013-10-14
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

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Laura Proctor
Laura Proctor 2012-2-16
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)

更多回答（1 个）

Oleg Komarov
Oleg Komarov 2012-2-16
I suggest you to read the chapter "Matrices and Arrays" from the Getting Started guide.
For matrix A:
A(1:3:end,:)

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