无法通过函数句柄作为函数的参数 [英] Cannot pass function handle as an argument of a function

问题描述

我是新来的Matlab和我想要编写自定义函数在MATLAB，将采取函数句柄作为它的一个参数。
我得到这个错误的所有时间：

I'm new to Matlab and I'm trying to write custom function in matlab that would take function handle as one of its arguments. I'm getting this error all the time:

Error using subsindex
Function 'subsindex' is not defined for values of class 'function_handle'.

试图调试我进行以下测试：我运行命令 X = fminbnd（@humps，0.3，1）。我继续如预期 - 我得到的结果 X = 0.6370 。
所以，我创建了一个名为列车自定义函数，我复制的所有的功能code fminbnd 到文件 train.m 。我唯一​​改变的是名称，这样的函数，code fminbnd 和列车现在是相同的除了名称

Trying to debug I performed following test: I run command x = fminbnd(@humps, 0.3, 1). I proceeded as expected - I got result x = 0.6370. So I created custom function called train and I copied ALL the code of function fminbnd to the file train.m. The only thing that I changed is the name, so that code of functions fminbnd and train is now identical except for the names.

现在我使用相同的参数同时运行的功能和自定义功能会抛出错误，而原始的 fminbnd 返回正确的答案。
这里是code：

Now I run both functions with the same argument and the custom function throws error while original fminbnd returns correct answer. Here is the code:

>> x = fminbnd(@humps, 0.3, 1)

x =

    0.6370

>> x = train(@humps, 0.3, 1)
Error using subsindex
Function 'subsindex' is not defined for values of class 'function_handle'.

下面是函数头列车（一切从复制 fminbnd ）

Here is header of function train (everything else is copied from fminbnd):

function [xf,fval,exitflag,output] = train(funfcn,ax,bx,options,varargin)

问题出在哪里？

Where is the problem?

推荐答案

做一个这列车给我看，有同名的神经网络工具箱功能。

Doing a which train showed me that there is a function in the neural network toolbox of the same name.

/Applications/MATLAB_R2009b.app/toolbox/nnet/nnet/@network/train.m  % network method

您可能会运行NNET train.m，而不是你认为你正在运行的之一。您在包含train.m的目录？当我确信我是在正确的目录，我得到了它工作：

You may be running the nnet train.m rather than the one you think you're running. Are you in the directory containing your train.m? When I made sure I was in the right directory, I got it to work:

>> which train
/Users/myuserid/train.m

>> x = train(@humps,0.3,1)

x =

    0.6370

也许你可以命名你的文件别的东西像 myfminbnd.m 呢？

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