Combining a function and solver to create a M-function in Simulink

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Wa3id
Wa3id 2019-11-14
回答： Wa3id 2019-11-18
If I have the following function and solver script:
The function is:
function dydt = odefcn(t,y,A,B)
dydt = zeros(2,1);
dydt(1) = y(2);
dydt(2) = (A/B)*t.*y(1);
The solver script:
A = 1;
B = 2;
tspan = [0 5];
y0 = [0 0.01];
[t,y] = ode45(@(t,y) odefcn(t,y,A,B), tspan, y0);
How can I combine both to create a "MATLAB function" block in Simulink that takes A and B as input, and outputs y?
Thanks a lot!

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采纳的回答

Wa3id
Wa3id 2019-11-18
For the benefit of those who may have the same question, you cannot use a MATLAB function, but you can use S-Function.

更多回答（1 个）

Fangjun Jiang
Fangjun Jiang 2019-11-14
Simulink is the perfect tool to solve this problem (get y output based on input A and B). Why take the awkward long route? In fact, I don't think it is even possilbe if it is required to solve it with a MATLAB Function block in Simulink.
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Fangjun Jiang
Fangjun Jiang 2019-11-14
When a MATLAB Function block is simulated in a Simulink model, it runs at every time step. Yet you need to solve a problem that is time related. At time t=1, the MATLAB Function block won't know or have access to info/value at time=5. That is why I think it is impossible.

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