在MATLAB中模拟级联索引的一些好方法是什么? [英] What are some good ways to emulate cascading indexing in MATLAB?

问题描述

例如我想做这样的事情:

E.g. I would like to do things such as:

A=4:20;
find(A>5)(2) % want to access the 2nd element of the index array returned by find

推荐答案

是的，此相当 经常在不同的上下文中 >，并且单行答案为subsref.对于您的情况，就是这样:

Yes, this comes up fairly frequently in different contexts, and the one-line answer is subsref. For your case, it is this:

subsref(find(A>5),struct('type','()','subs',{{2}}))

更清洁的解决方案使用未记录的builtin:

A much cleaner solution uses an undocumented builtin:

builtin('_paren',find(A>5),2)

作为丑陋语法或未记录功能的替代方法，您可以定义一个类似于以下内容的小型函数，

As an alternative to ugly syntax or undocumented functionality, you could define a small function like the following,

function outarray = nextind(inarray,inds)
outarray = inarray(inds);

或内联函数:

nextind = @(v,ii) v(ii);

并像nextind(find(A>5),2)一样调用它.这比subsref干净，如果要执行线性索引(不是下标)，则很好.

And call it like nextind(find(A>5),2). This is cleaner than subsref and good if you are doing linear indexing (not subscripts).

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