Simulink subsystem to numerically solve a complex exponential function

This is the Matlab script of what I have to solve at each iteration of a complex simulink model:

B, T and W known; solving for a:

sol = vpasolve( 0.88*(1-exp(-0.1*B))*(1-exp(-9.5*a)) - (0.9/B + 0.5*a/sqrt(B)) - T/W, a)

I cannot use this directley in a user defined Simulink funcation since symbolc variables are not accepted.

How would you suggest to draw/code this in Simulink?

Thanks!

Answer 1

[Pavan Guntha]

Hello Ario,

You could follow the following steps to solve the issue:

1) Create a '.m' file containing the function (for example, name it complexExponential.m) to solve the complex exponential equation.

2) You could use a MATLAB Function block in Simulink to call this function as shown below.

coder.extrinsic('complexExponential');
out = 0;
out = double(complexExponential(inputs));

Since the equation involves symbolic variables, it is necessary to use 'coder.extrinsic()' to avoid generating code for it. For more details you could have a look at the documentation page of coder.extrinsic.

Hope this helps!