matlab fmincon调用从c ++ [英] matlab fmincon calling from c++

问题描述

我试图从c ++调用Matlab的 fmincon 函数。我正在使用调用

I am trying to call Matlab's fmincon function from c++. I am using the call

mxcallMatlab(2, &arg1, 4, &arg2, "fmincon");

其中 arg2是一个Matlab mxArray 数组4（即它被定义为 mxArray * arg2 [4] ）。 arg2 接受 fmincon 的四个不同参数。 arg2 [0] 问题是我如何将目标函数句柄传递给 arg2 [0] <0> fmincon / code>。
我的目标函数没有在Matlab中定义，而是在c ++中。我将目标函数指针转换为double（这是我必须做的，因为对Matlab的所有输入都是double），然后传递给 arg2 [0] ？

where arg2"is a Matlab mxArray array of dimension 4 (i.e. it is defined as mxArray *arg2[4]). arg2 takes in the 4 different argument to fmincon. arg2[0] should be the objective function handle which fmincon uses as its first argument. The question is how do I pass the objective function handle to arg2[0]. My objective function is not defined in Matlab, but in c++. Shall I cast my objective function pointer to double (this I have to do because all inputs to Matlab are double), and then pass that to arg2[0]?

推荐答案

href =http://www.mathworks.de/matlabcentral/answers/44778 =nofollow>此处：

As found here:

只有MATLAB可以调用MATLAB函数句柄。
中的函数句柄MATLAB是一个数据结构，包括一个
引用一个数据块，该数据块将MATLAB代码存储在一个预解析的
线程解释器格式，需要由MATLAB
引擎解释。 MATLAB .m代码不能编译成机器语言，只能
到链接的数据结构。

Only MATLAB can invoke MATLAB function handles. Function handles in MATLAB are a data structure that include (amongst other things) a reference to a data block that stores MATLAB code in a pre-parsed threaded-interpreter format that needs to be interpreted by the MATLAB Engine. MATLAB .m code does not compile down to machine language, only to linked data structures.

你想要的，直接为你想要的。你必须在一个单独的MEX文件中定义目标函数，在Matlab中定义一个函数句柄，并将它传递给MEX，调用 fmincon 。所以，像

So you cannot achieve what you want, as directly as you want it. You'll have to define the objective function in a separate MEX file, define a function handle to it in Matlab to it, and pass that on to the MEX where you call fmincon. So, something like

[sol, fval, ...] = your_main_mex(@your_objective_mex, ...)

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