% mark.tex  93.06.09
% man commands mark .
% Copyright 1983-1992   Albert Davis
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\section{{\tt MArk} command}
\index{mark command}
\index{transient reruns}
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\subsection{Syntax}
\begin{verse}
{\tt MArk}
\end{verse}
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\subsection{Purpose}

Remember circuit voltages and currents.
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\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.
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\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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