M-Function Block Simulink wrong output datasize.

Hi, I have some problems with my Simulink (Simscape) M-function block. I would like to integrate a mathlab function that receives a voltage value as input and rounds it (Typ:double). This is used to search for a row from a table and the last four entries of this row are to be output in a variable.

However, I get the error:

Dimension 1 is fixed on the left-hand side but varies on the right ([1 x 1] ~= [:? x 1]).

Function 'Subsystem2/MATLAB Function' (#50.844.851), line 30, column 5:

"Trafo_1"

The Model Explorer is set to:

-suport variable-size arrrays

-saturate on intager overflow

-interpret output column vactors as one-dimensional data

The Values are all set to the type: double / Size:1 / Complexity:off

function [Trafo_1, Trafo_2, Trafo_3, Trafo_4] = Auswahl_Trafo(U)

%% Wahrheitstabelle für Betragstrafos

AnzahlZeilen = 81;

AnzahlSpalten = 4;

AnzahlKombinationen = 3^AnzahlSpalten;

Tabelle = zeros(AnzahlZeilen,AnzahlSpalten+1);

% Erstellen der Tabelle mit dem Argumenten -1, 0, 1

for i = 1:AnzahlZeilen

KombinationIndex = mod(i-1, AnzahlKombinationen) + 1;

Argumente = dec2base(KombinationIndex-1, 3, AnzahlSpalten) - '0';

Argumente(Argumente == 2) = -1;

Trafo = [0.2 0.6 1.8 5.4];

delta_U = 0;

for k = 1:4

delta_U = delta_U + Argumente(k) * Trafo(k);

end

delta_U = round(delta_U*100)/100;

Tabelle(i,:) = [delta_U Argumente];

end

Tabelle = sortrows(Tabelle,1,"descend");

%% Auswahl des geeigneten Tabelleneintrags

u_soll = round(U*5)/5;

z = find(Tabelle == u_soll);

Trafo_1 = Tabelle(z,2);

Trafo_2 = Tabelle(z,3);

Trafo_3 = Tabelle(z,4);

Trafo_4 = Tabelle(z,5);

end

Answer 1

[Andreas Goser]

I found this here which has a very similar error message and as there is code generation behind the scences with Simscape, this might be of help.

If that does not help, could you upload a reproduction example?