访问单元格的预定义元素 [英] Access predefined elements of cells

问题描述

我有一个单元格数组A [1x80]，其中每个元素本身就是一个单元格数组[9x2]. 我还有一个向量B，它代表A的一组选定单元格，我想提取每个选定单元格的元素{2,2}.

I have a cell array A [1x80] in which each element is a cell array itself [9x2]. I have also a vector B representing a group of selected cells of A and I want to extract the element {2,2} of each selected cell.

我尝试了一个简单的

A(1，B){2,2}

A(1,B){2,2}

但是它当然不起作用... 你能帮我吗?

but of course it doesn't work.... Can you help me?

推荐答案

这是怎么回事:

A = {{1 2; 3 4}, {5 6;7 8}, {9 0; 1 2}; {3 4; 5 6}, {7 8; 9 0}, {11 22; 33 44}};
B = [2,3]

[cellfun(@(x)x(2,2), A){1, B}]

ans =

   8   2

以上内容实际上仅以八度为单位.正如@Amro指出的那样，要对其进行修改以在Matlab中运行，您需要使用一个临时变量:

The above actually only works in octave. As @Amro points out, to modify it to work in Matlab you need to use a temporary variable:

temp = cellfun(@(x)x(2,2), A);
[temp{1, B}]

或在一个班轮中(也要感谢@Amro)

or in a one liner (also thanks to @Amro)

cellfun(@(c)c{2,2}, A(1,B))

这篇关于访问单元格的预定义元素的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！