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Non-normatively mention result-reference from 'der' #3871

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HansOlsson merged 2 commits into from
Apr 20, 2026
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Non-normatively mention result-reference from 'der' #3871

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Non-normatively mention result-reference from 'der'
henrikt-ma Apr 13, 2026
437745d
Drop 'outside annotations'
henrikt-ma Apr 17, 2026
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7 changes: 7 additions & 0 deletions chapters/operatorsandexpressions.tex
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Expand Up @@ -813,10 +813,17 @@ \subsection{Derivative and Special Purpose Operators with Function Syntax}\label
The operator is not allowed inside \lstinline!function! classes.
If $\mathit{expr}$ is an array, the operator is applied to all elements of the array.
For non-scalar arguments the function is vectorized according to \cref{vectorized-calls-of-functions}.

\begin{nonnormative}
For \lstinline!Real! parameters and constants the result is a zero scalar or array of the same size as the variable.
\end{nonnormative}

\begin{nonnormative}
There is also a two argument form of \lstinline!der! used in annotations, see \productionref{result-reference} in the grammar.
This form is used to refer to higher order derivatives of a component as described in \cref{plot-curves}.
It is not valid as a general expression outside annotations.
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\end{nonnormative}

\begin{example}
For continuous expression we have several cases.
\begin{lstlisting}[language=modelica]
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