如何从元胞数组调用函数句柄？

Question

我试图做的是保留一个函数句柄的元胞数组，然后在循环中调用其中一个。它不起作用，在我看来，我得到的只是一个 1x1 元胞数组，而不是其中的函数句柄。

我不固定使用单元格数组，所以如果另一个集合工作对我来说很好。

这是我的代码：

func_array = {@(x) x, @(x) 2*x }
a = func_array(1) %%% a = @(x) x
a(2) %%% (error-red) Index exceeds matrix dimensions.
a(0.2) %%% (error-red) Subscript indices must either be real positive integers or
logicals.

谢谢阿米尔

Answer 1

问题出在这一行：

a = func_array(1)

you need to access the content of the cell array, not the element.

a = func_array{1}

and everything works fine. The visual output in the command window looks the same, which is truly a little misleading, but have a look in the workspace to see the difference.

As mentioned by chappjc in the comments, the intermediate variable is not necessary. You could call your functions as follows:

func_array{2}(4)    %// 2*4

ans =  8

Explanation of errors:

a(2) %%% (error-red) Index exceeds matrix dimensions.

a is still a cell array, but just with one element, therefore a(2) is out of range.

a(0.2) %%% (error red) Subscript indices must either be real positive ...

... and arrays can't be indexed with decimals. But that wasn't your intention anyway ;)