MATLAB - 从向量中删除前导零和尾随零 [英] MATLAB - Remove Leading and Trailing Zeros From a Vector

问题描述

我有一个带有前导零和尾随零的小波函数.我想去除小波之前或之后出现的所有零点.但是，我不想删除小波本身中的任何零.为简化起见，假设我有以下 1x11 向量:

I have a wavelet function with leading and trailing zeros. I would like to strip all the zeros which occur before or after the wavelet. However, I would not like to remove any zeros within the wavelet itself. To simplify, let's say I have the following 1x11 vector:

0 0 0 -2 -1 0 -1 -2 0 0 0

去除前导零和尾随零后，向量应为:

After removing leading and trailing zeros the vector should be:

-2 -1 0 -1 -2

我的实际向量很大，性能是我最关心的问题.我是 MATLAB 新手，如果您有任何有关如何尽可能高效地完成此任务的提示，我将不胜感激.

My actual vectors are large and performance is my primary concern. I am a MATLAB novice and would appreciate any tips on how to accomplish this task as efficiently as possible.

推荐答案

试试这个

 y = x(find(x,1,'first'):find(x,1,'last'));

find(x,1,'option') 命令为您提供第一个和最后一个非零索引.

The find(x,1,'option') command gives you first and last non-zero indices.

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