从Java类型回到MATLAB类型 [英] Moving from Java types back to MATLAB types

问题描述

我在MATLAB工作区中有一个Java数组(在下面的示例中为my_array)，我想将其转换回MATLAB数组.

I have a Java array (my_array in the example below) in my MATLAB workspace that I would like to convert back to a MATLAB array.

whos my_array

  Name       Size            Class                                    

  my_array   20000x1            java.lang.Object[]

我在外部接口文档中找不到如何将Java类型转换回MATLAB类型的方法.我发现的唯一内容是此(有关MATLAB单元的文档)，其中说我可以使用MATLAB单元即可完成此任务.

I could not find how to convert Java types back to MATLAB types in the External Interfaces documentation. The only thing I found is this (the documentation about MATLAB cells) which says that I can use MATLAB cells to do this task.

使用MATLAB cells似乎是一个矫kill过正，特别是当我处理成千上万个相同类型的元素(在本例中为double)时.还有其他方法可以将Java对象移回MATLAB的本机类型吗?

Using MATLAB cells seems an overkill, specially when I am handling thousands of elements of the same type (in this case, double). Is there any other way of moving Java objects back into MATLAB's native types?

推荐答案

示例:

%# example Object[] array
my_array = javaArray('java.lang.Object', 5);
for i=1:5, my_array(i) = java.lang.Double(i); end

%# convert to MATLAB vector
M = arrayfun(@(x)x, my_array);

%# or equivalently
M = cell2mat( cell(my_array) );

>> whos M
  Name      Size            Bytes  Class     Attributes

  M         5x1                40  double      

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