在Matlab中创建此矩阵 [英] creating this matrix in matlab
本文介绍了在Matlab中创建此矩阵的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
给出
A=[a_1 a_2 a_3 ... a_n]
如何制作?
[a1 ... a100]
[a2 ... a101]
...
[an-100+1 ... an]
我不想在这里使用for循环,因为我想加快速度. 谢谢.
I want to not use for-loop here since I want to speed it up. Thank you.
推荐答案
您可以使用:
n = numel(A);
m = 100;
I = bsxfun(@plus, 1:m, (0:n-m).');
B = A(I);
作为旁注:for
循环执行的那不好:
As a sidenote: The for
loop doesn't perform that bad:
B = zeros(n-m+1, m);
for i = 1:size(B)
B(i,:) = A(i:i+m-1);
end
就我的测试而言,它仅慢4倍,而且无论如何,此计算都几乎不会成为您程序中的瓶颈.
As far as my testing goes, it is slower only by a factor of 4 and this calculation should hardly be a bottleneck in your program anyway.
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