在向量子集上进行MATLAB计算，然后移位并重复 [英] MATLAB calculation on subset of vector, then shift, and repeat

问题描述

我需要取向量的一个子集的最大值，然后在向量中移动.例如列向量

I need to take the max of a subset of a vector and then shift through the vector. For instance the column vector

a=[1;2;3;4;5;6;7]

如何获取max(a(1:3))，max(a(2:4))，...，max(a(5:end))并将所有输出放置在另一个向量中?我可以轻松地通过for循环执行此操作，但是我正在寻找一种使用MATLAB中的矩阵运算(最好是在一行代码中)进行操作的优雅方式(即使我意识到MATLAB中的矩阵运算可能会这样做)正在使用for循环来实现).

how can I take max(a(1:3)), max(a(2:4)), ..., max(a(5:end)) and place all the output in another vector? I can easily do this with a for loop however I'm looking for an elegant way of doing so using matrix operations in MATLAB and preferably in a single line of code (even though I realize that the matrix operations in MATLAB to do so may likely be using a for loop to implement).

谢谢！

推荐答案

假设您的移位和窗口长度是恒定的(分别为1和3)，则可以使用

Assuming that your shift and window length is constant (1 and 3 in your case resp.), you can use nlfilter to define a general sliding-window operations on a vector:

a = [1:7];

fun = @(x) max(x(:));
b = nlfilter(a, [1 4], fun);

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