S-Function Builder Outputs

Hello everyone, i think my problem is pretty simple, but I just can't figure out the problem. I want to build a standard S-Function with the help of the S-Function Builder. I have 4 Inputs, 4 Parameters and 2 Outputs. I entered my Inputs and Parameters in the respective fields in the Sfun-Builder. My formula for the output look like this: Tho = (Pel + Mh * Thi * c + Ms * Tsi * c - (Ms * c * (sqrt(pow(CG,2) * pow(Ms,2) * pow(Pel,2) + 4 * CG * pow(Mh,2) * Ms * Pel * Thi * c + 4 * CG * pow(Mh,2) * Ms * Pel * c * k + ... (its pretty long but it goes on like the part i posted).

When i click on "Build" in the Sfun-Builder i get a lot of errors but they are mostly the same. All refering to the line with my formula. The errors are:

error C2296 '*' : illegal, left operand has type 'const real_T *'

error C2297 '*' : illegal, right operand has type 'const real_T *'

error C2440 'function' ; cannot convert from 'const real_T *' to double

warning C4024 'pow' : different types for formal and actual parameter 1

I get these errors all over again until the error count exceeds 100 and the compiling stops. I need this to run for an important work! So please help me out here =)

Answer 1

[Titus Edelhofer]

Hi,

please keep in mind, that Simulink (and S-Function Builder) assumes all signals to possibly be vector valued. Therefore, all inputs and outputs are arrays. You will need to write e.g. PEL[0] instead of PEL.

Titus

[Mark]

Works perfectly! Thank you very much, Titus!