Matlab:独特功能的行为 [英] Matlab: Behavior of the unique function

问题描述

我目前正在将代码从R2012a迁移到R2013b.

I'm currently migrating code from R2012a to R2013b.

我注意到unique函数的行为已更改:

I noticed that the unique function behavior has changed:

R2012a

>> size(unique([]))

ans =

     0     0

R2013b

>> size(unique([]))

ans =

     0     1

在我看来，将x删除后，0x0矩阵将变为0x1矩阵，这与我的直觉相反，这实际上是唯一函数所做的事情.有人对此有道理吗?

It seems counter-intuitive to me that a 0x0 matrix would become a 0x1 matrix after removing doublons, which is essentially what the unique function does. Does anybody has a rationale for this?

推荐答案

如果您需要使用旧的行为，则R2013a的行为已更改:

The behaviour has changed with R2013a, if you need the old behaviour use:

size(unique([],'legacy'))

如果两个版本都需要代码，我建议编写一些函数，新版本调用unique(x,'legacy')，旧版本调用unique(x).

If you need code for both versions, I would recommend to write some function which calls unique(x,'legacy') for new versions and unique(x) for old versions.

btw:与union，intersect，setdiff，setxor和ismember

btw: same issue with union, intersect, setdiff, setxor and ismember

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