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chapters/operatorsandexpressions.tex

@@ -791,10 +791,10 @@ \subsubsection{delay}\label{delay}
 \lstinline!delay! allows a numerical sound implementation by interpolating in the (internal) integrator polynomials, as well as a more simple realization by interpolating linearly in a buffer containing past values of expression $\mathit{expr}$.
 Without further information, the complete time history of the delayed signals needs to be stored, because the delay time may change during simulation.
 To avoid excessive storage requirements and to enhance efficiency, the maximum allowed delay time has to be given via $\mathit{delayMax}$.
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 This gives an upper bound on the values of the delayed signals which have to be stored.
 For real-time simulation where fixed step size integrators are used, this information is sufficient to allocate the necessary storage for the internal buffer before the simulation starts.
 For variable step size integrators, the buffer size is dynamic during integration.
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 In principle, \lstinline!delay! could break algebraic loops.
 For simplicity, this is not supported because the minimum delay time has to be given as additional argument to be fixed at compile time.
 Furthermore, the maximum step size of the integrator is limited by this minimum delay time in order to avoid extrapolation in the delay buffer.