Avoid for loop?

4 次查看（过去 30 天）
grega
grega 2018-12-19
回答： Stephen23 2018-12-19
I want to generate arbitrary matrix of indeces, e.g.:
1 2 3 4
2 3 4 5
3 4 5 6
4 5 6 7
5 6 7 8
6 7 8 9
One can observe a series in it. I solved the problem as follows:
% --- Inputs
x = 1:9;
window = 4;
% --- creating the matrix
mm = length(x);
nb_rws = mm - window + 1;
y = ones(nb_rws,window);
for i = 1 : nb_rws
y(i,:) = x(i : i + window -1);
end
y
Is there a solution to avoid the for loop? Thanks..

请先登录，再回答此问题。

采纳的回答

madhan ravi
madhan ravi 2018-12-19
编辑：madhan ravi 2018-12-19
y=hankel((1:4),(4:9))'
Gives:
y =
1 2 3 4
2 3 4 5
3 4 5 6
4 5 6 7
5 6 7 8
6 7 8 9

更多回答（1 个）

Stephen23
Stephen23 2018-12-19
Simpler:
>> hankel(1:6,6:9)
ans =
1 2 3 4
2 3 4 5
3 4 5 6
4 5 6 7
5 6 7 8
6 7 8 9

类别

在 Help Center 和 File Exchange 中查找有关 Loops and Conditional Statements 的更多信息

标签

产品


版本

R2015b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by