如何在函数的输出上使用索引? [英] How can I use indexing on the output of a function?

问题描述

可能重复:
如何我索引了函数返回的MATLAB数组，而没有先将其分配给局部变量?

Possible Duplicate:
How can I index a MATLAB array returned by a function without first assigning it to a local variable?

我想在函数的输出上使用索引.我使用textscan函数读取非常大的文本文件(15 GB).在我的情况下，textscan函数的返回值是一个1x1的单元格数组，其中包含一个非常大的数字数组.

I would like to use indexing on the output of a function. I use the textscan function to read very large text files (15 GB). The return of the textscan function in my case is a 1x1 cell array that contains a very large numeric array.

代替:

tmp = textscan(...);
final_result = mat2cell(tmp{1,1});

我想这样做:

final_result = mat2cell( textscan(...){1,1} );

如果这行得通，它将避免创建非常大的临时变量tmp.还有另一种避免临时变量的方法吗?

If this would work, it would avoid the creation of the very large temporary variable tmp. Is there another way to avoid the temporary variable?

推荐答案

如果您仍然想知道，请考虑以下示例:

In case you are still wondering, consider this example:

%# some function that returns a cell array (TEXTSCAN in your case)
myFunc = @() {rand(5,5)};

%# normally you would write
C = myFunc();
C = C{1,1};

这是

Here is the cellarray-version of @gnovice answer in the linked question (ugly but works):

%# equivalent to: C = myFunc(){1,1}
C = subsref(myFunc(), struct('type','{}','subs',{{[1 1]}}))

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