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%$Id: mark.tex,v 1.2 96/03/30 18:03:25 al Exp $
% man commands mark .
%------------------------------------------------------------------------
\section{{\tt MARK} command}
\index{mark command}
\index{transient reruns}
%------------------------------------------------------------------------
\subsection{Syntax}
\begin{verse}
{\tt MArk}
\end{verse}
%------------------------------------------------------------------------
\subsection{Purpose}
Remember circuit voltages and currents.
%------------------------------------------------------------------------
\subsection{Comments}
After the {\tt mark} command, the {\tt transient} and {\tt fourier} analysis
will continue from the values that were kept by the {\tt mark} command,
instead of progressing every time.
This allows reruns from the same starting point, which may be at any time,
not necessarily 0.
%------------------------------------------------------------------------
\subsection{Examples}
\begin{description}
\item[{\tt transient 0 1 .01}] A transient analysis starting at zero,
running until 1 second, with step size .01 seconds. After this run, the
clock is at 1 second.
\item[{\tt mark}] Remember the time, voltages, currents, etc.
\item[{\tt transient}] Another transient analysis. It continues from 1
second, to 2 seconds. (It spans 1 second, as before.) This command was not
affected by the {\tt mark} command.
\item[{\tt transient}] This will do exactly the same as the last one. From
1 second to 2 seconds. If it were not for {\tt mark}, it would have started
from 2 seconds.
\item[{\tt transient 1.5 .001}] Try again with smaller steps. Again, it
starts at 1 second.
\item[{\tt unmark}] Release the effect of {\tt mark}.
\item[{\tt transient}] Exactly the same as the last time, as if we didn't
{\tt unmark}. (1 to 1.5 seconds.)
\item[{\tt transient}] This one continues from where the last one left off:
at 1.5 seconds. From now on, time will move forward.
\end{description}
%------------------------------------------------------------------------
%------------------------------------------------------------------------
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