Undefined function or variable

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Hello,

I have a matlab file matlab_ode45_h.m:

function y = matlab_ode45_h(h, y0)
[T,Y] = ode45(@matlab_ft, [0 0.5*h h], y0);
y = Y(3,:);

I compile it using matlab compiler into a static library and call the function matlab_ode45_h from c++ code. I'm getting the following:

??? Undefined function or variable "h".

Error in ==> matlab_ode45_h at 4

How may this happen?

Thanks

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Answer 1

Walter Roberson 2011-6-19

1 个投票

That could happen if you do not pass anything in from C++ when you call matlab_ode45, or if somehow the argument marshaling between C++ and MATLAB is not set up correctly.

What C++ call are you using?

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Linar 2011-6-19

I've modified the matlab function (see above) since I'm solving ODE for h time units and not interested what's happening in between. But I'm still getting the similar error message.

This is how I call the matlab function:

double h_ = TimeStep;

double y0_[N];

//set y0_

mwArray h(1, 1, mxDOUBLE_CLASS, mxREAL);

h.SetData(&h_, 1);

mwArray y0(1, N, mxDOUBLE_CLASS, mxREAL);

y0.SetData(y0_, N);

mwArray y;

matlab_ode45_h(1, y, h, y0);

Kaustubha Govind 2011-6-20

Do you call the MCR and library initialize and terminate functions in the right order? If yes and you still see the issue, could you try the documentation example and see if you can get it to work: http://www.mathworks.com/help/toolbox/compiler/f2-995712.html#f2-1009231

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