Create a matrix with only the rows indexed by a multiple of N of another matrix.

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TOMAS CARRERA DE SOUZA
评论： Prasad Reddy 2020-5-4
Hello everyone!
And I am trying to create a matrix, containing only the rows indexed by (1+3x) of a given matrix. In other words, the first row and then jump every 3 rows until the end of the original matrix
Concretely, I have something that looks like this:
x1 = randi([0, 10], [9,2])
x1 =
5 10
4 6
4 5
2 1
1 1
4 8
9 8
3 5
6 6
And I am trying to get this:
x2 =
5 10
2 1
9 8
Is there any straightforward way to do this?
Thanks!

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采纳的回答

David Hill
David Hill 2020-5-4
x2=x1(1:3:length(x1),:);

更多回答（1 个）

Prasad Reddy
Prasad Reddy 2020-5-4
clc
clear all
x1=randi([0,10],[9,2])
x2=[]
for i=1:3:length(x1)
x2=[x2; x1(i,:)]
end
% this will work

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