append和x = [x，element]之间的差异 [英] Difference between append and x = [x, element]

问题描述

我已经创建了一个数组X作为X = [1 2 3 4 5]，并且我想在其末尾插入0.

使用X = [X, 0]和X = append(X, 0)有什么区别吗?

我什么都没找到，我不确定是否可以注意到其中的区别.

提前谢谢！

解决方案

如另一个答案中所述，append是工具箱的一部分，并非对所有人都可用.

但是，附加到矩阵的正确方法是

X(end+1) = 0;

这比X=[X,0]效率要高得多.不同之处在于，后一种形式创建了一个新数组，并将原始数组复制到其中.另一种形式只是附加到矩阵，通常不需要重新分配. 在此处查看显示差异的实验(阅读实验的两个部分的问题和我的答案). >

I've create an array X as X = [1 2 3 4 5] and I want to insert 0 at the end of it.

Is there any difference in using X = [X, 0] and X = append(X, 0)?

I didn't find anything about and I'm not sure if I can notice the difference.

Thanks in advance!

解决方案

As explained in the other answer, append is part of a toolbox, and not available to everyone.

The correct way to append to a matrix, however, is

X(end+1) = 0;

This is a whole lot more efficient than X=[X,0]. The difference is that this latter form creates a new array, and copies the original one into it. The other form simply appends to the matrix, which usually doesn't require reallocation. See here for an experiment that shows the difference (read the question and my answer for both parts of the experiment).

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