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MagicDraw/Cameo could not handle export of the following guard expressions from the Modelica by Example Decay2 example:
der(x) = if x>=0 then -sqrt(x) else 0;
der(x)=null0null-sqrt(x)nullnull;
It turns out, however, that MagicDraw/Cameo can export the following fine (just not the inline form):
if x>=0 then
der(x)=-sqrt(x);
else
der(x)=0;
end if;
The OpenModelica docs use the following terminology:
If clause:
parameter Boolean linear=true;
parameter Boolean quadratic=false;
Real x, y;
equation
if linear then
y = x + 1;
elseif quadratic then
y = x^2 + x + 1;
else
y = Modelica.Math.sin(x) + 1;
end if;
Integer i;
Integer sign_of_i=if i<0 then -1 else if i==0 then 0 else 1;
The SysPhS-1.1 spec seems to refer to these forms as if-equation and if-statement (see p.9 under 8 Language for Mathematical Expressions):
The SysPhS expression grammar includes a subset of Modelica’s grammar, as follows:
- All terminal symbols
- The following non-terminal symbols: equation, statement, if-equation, if-statement, for-statement, for-indices, for-index, while-statement, expression, simple-expression, logical-expression, logical-term, logical-factor, relation, relational-operator, arithmetic-expression, add-operator, term, mul-operator, factor, primary, name, component-reference, function-call-args, function-arguments, function-arguments-non- first, named-arguments, named-argument, function-argument, output-expression-list, expression-list, array-subscripts, subscript
This page contains content quoted, copied, or adapted, from the following Object Management Group specification for educational purposes: SysPhS-1.1. The OMG retains the original © copyright.