How to write an odefunction in Simulink which takes input from Simulink?

Hello,

I am having trouble using ode15s in simulink. I require to define an odefunction which involves parameters transferred from another simulink block. If I write(a,b,c are the parameters computed in another block and used as input to this block)

fun=@(t,y)(a*y^2+b*y+c)

I get an error regarding invalid use of anonymous function in code generation.So I created an external function 'fun.m' and using 'coder.extrinsic('fun') in Simulink. It goes as

function dy=fun(t,y)
dy=a*y^2+b*y+c
end

The problem is, I cannot input a,b and c here. If instead, I modify the function to take a,b,c as input i.e.,

function dy=fun(t,y,a,b,c)

I wont be able to write this function directly. I also tried this

function dy=fun(a,b,c)
dy=@(t,y)(a*y^2+b*y+c);
end

And then in Simulink

func=fun(A,B,C)
ts=[0 10]
ode15s(func,ts,0);

But then again I get the error of invalid anonymous function in code generation.

I am confused.Any possible solution/workaround will be greatly appreciated.

Thanks.

P.S.: I am not using 2016b which allows anonymous functions in code generation. Also, the above code is purely an illustration of the actual one.

[Chinmay Sharma]

I would love to hear comments on missing details in the question, if there are any.