index returned array directly

Question

William 2011-4-20

3
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/5890-index-returned-array-directly

I'm pretty sure the answer to this question is no but I'm hoping to be surprised. Is it possible to directly index a returned array without first assigning a variable? I created a simple trivial example below to explain what I mean.

Simple Example By variable assignment:

x = 1:10;
y = find( x>5 );  % y is a temporary variable
desired = y(1:2)  % y1 is the desired matrix

Simple Example by Direct Index

x = 1:10;
desired = find( x>5 )[1:2]  % 'suggested' code

To be clear the second line above is not meant to, nor does it work. I'm providing a comparison of working and theoretical code to suggest what I mean by 'direct index'.

William

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

James Tursa 2011-4-20

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/5890-index-returned-array-directly#answer_8244

No. This topic has been discussed many, many times on the newsgroup.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Sean de Wolski 2011-4-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/5890-index-returned-array-directly#answer_8239

在 MATLAB Online 中打开

For this specific case:

desired = x(find( x>5,2,'first'))

For the more general case (i.e. not FIND)

http://www.mathworks.com/matlabcentral/answers/4536-getting-only-first-component-from-vector-matrix-output

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

William 2011-4-20

Sean de is correct for the case given but I should have been more clear. I am looking for the general case, I arbitrarily chose find as an example of when this might be useful.

请先登录，再进行评论。