I want to index across multiple dimensions using a vector, as opposed to comma notation

1 次查看（过去 30 天）
SeanC
SeanC 2017-3-29
编辑： Stephen23 2017-3-29
E.g.
I have a matrix A. This matrix will have a different number of dimensions depending upon what is input to my function.
I want to be able to use a vector(i.e. IndexingVector = [2 3 4 5]) to get the information I need:
A(IndexingVector) would be the same as saying A(2,3,4,5).
This means that if A happens to have a different number of dimensions when the function has different inputs, I could still use IndexingVector to get the information I need.
Thanks

请先登录，再回答此问题。

回答（1 个）

Stephen23
Stephen23 2017-3-29
编辑：Stephen23 2017-3-29
Lets first create some fake data:
>> A = randi(9,4,3,2); % the data
>> V = [3,2,1]; % the indices in a vector
>> C = num2cell(V);
>> A(3,2,1) % writing it out
ans =
7
Method One: a simple comma-separated list:
>> A(C{:})
ans =
7
Method Two: use sub2ind:
>> A(sub2ind(size(A),C{:}))
ans =
7
Method Three: call subsref directly:
>> subsref(A,struct('type','()','subs',{num2cell(V)}))
ans =
7

类别

在 Help Center 和 File Exchange 中查找有关 Matrix Indexing 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by