查找索引矩阵的Matlab [英] Find index matrix Matlab

问题描述

矩阵维和 find 函数有问题。

对于每一行，我试图找到与大于20的值相关的索引，并将结果存储在另一个矩阵中。

例如：

  A = [
 10 21 30 
 1 40 50 
 1 0 0 
 50 10 3]; 
 
 
索引= 
 2 3 
 2 3 
 0 
 1 
  

有什么建议？ 使用找到和 accumarray

 >> ; [r c] = find（A> 20）; 
>> index = accumarray（r，c，[]，@（x）{x}）
 
 index = 
 [2,3] 
 [2,3] 
 [] 
 [1] 
  

请注意， code>是一个cellarray。

I have a problem with matrix dimension and the find function.

For each row, I'm trying to find the index related to the value greater than 20 and store the result in another matrix.

For example:

A = [
    10  21  30
     1  40  50
     1   0   0 
    50  10   3];


index = 
    2 3 
    2 3
    0
    1

Any suggestions?

解决方案

Use find and accumarray

>> [r c] = find( A > 20 );
>> index = accumarray( r, c, [], @(x) {x} )

index = 
 [ 2, 3 ]
 [ 2, 3 ]
       []
 [    1 ]

Note that index is a cellarray.

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