node571.html

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<html><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><!--Converted with jLaTeX2HTML 2002 (1.62) JA patch-1.4patched version by:  Kenshi Muto, Debian Project.LaTeX2HTML 2002 (1.62),original version by:  Nikos Drakos, CBLU, University of Leeds* revised and updated by:  Marcus Hennecke, Ross Moore, Herb Swan* with significant contributions from:  Jens Lippmann, Marek Rouchal, Martin Wilck and others --><HTML><HEAD><TITLE>41.1.8 Variable Tracing</TITLE><META NAME="description" CONTENT="41.1.8 Variable Tracing"><META NAME="keywords" CONTENT="everything"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"><META NAME="Generator" CONTENT="jLaTeX2HTML v2002 JA patch-1.4"><META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"><LINK REL="STYLESHEET" HREF="everything.css" tppabs="http://www.isi.edu/nsnam/ns/doc/everything.css"><LINK REL="next" HREF="node572.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node572.html"><LINK REL="previous" HREF="node570.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node570.html"><LINK REL="up" HREF="node563.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node563.html"><LINK REL="next" HREF="node572.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node572.html"></HEAD><BODY ><!--Navigation Panel--><A NAME="tex2html10212"  HREF="node572.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node572.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html10206"  HREF="node563.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node563.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html10200"  HREF="node570.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node570.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html10208"  HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html"><IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="file:/usr/share/latex2html/icons/contents.png"></A> <A NAME="tex2html10210"  HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html"><IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="file:/usr/share/latex2html/icons/index.png"></A> <BR><B> Next:</B> <A NAME="tex2html10213"  HREF="node572.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node572.html">41.1.9 Executing Tcl Procedures</A><B> Up:</B> <A NAME="tex2html10207"  HREF="node563.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node563.html">41.1 Nam Trace Format</A><B> Previous:</B> <A NAME="tex2html10201"  HREF="node570.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node570.html">41.1.7 Agent Tracing</A> &nbsp <B>  <A NAME="tex2html10209"  HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>  &nbsp <B>  <A NAME="tex2html10211"  HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <BR><BR><!--End of Navigation Panel--><H2><A NAME="SECTION010218000000000000000">41.1.8 Variable Tracing</A></H2><P>To visualize state variables associated with a protocol agent, we usefeature trace events.Currently we allow a feature to display a simple variable, i.e., avariable with a single value. Notice that the value is simple treated as a string (withoutwhite space).Every feature is required to be associated with an agent. Then, it can be added or modified at any time after its agent is created.The trace line to create a feature is:<BR><TT>f -t time -s src -a agentname -T type -n varname -v value -o prev value</TT><BR>Flag <TT>&lt;type&gt;</TT> is <DL><DT><STRONG>v</STRONG></DT><DD>for a simple variable</DD><DT><STRONG>l</STRONG></DT><DD>for a list</DD><DT><STRONG>s</STRONG></DT><DD>for a stopped timer</DD><DT><STRONG>u</STRONG></DT><DD>for an up-counting timer</DD><DT><STRONG>d</STRONG></DT><DD>for a down-counting timer.</DD></DL><P>However, only <TT>v</TT> is implemented in . Flag <TT>-v &lt;value&gt;</TT> gives the new value of the variable. Variable values are simple ASCII strings obeying the TCL stringquoting conventions. List values obey the TCL list conventions. Timer values are ASCII numeric. Flag <TT>-o &lt;prev value&gt;</TT> gives the previous value of the variable. This is used in backward animation.Here is an example of a simple feature event:<BR><TT>f -t 0.00000000000000000 -s 1 -n C1_ -a srm(1) -v 2.25000 -T v</TT><BR><P>Features may be deleted using:<BR><TT>f -t time -a agent name -n var name -o prev value -X</TT><BR><P><HR><!--Navigation Panel--><A NAME="tex2html10212"  HREF="node572.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node572.html"><IMG WIDTH="37" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="next" SRC="file:/usr/share/latex2html/icons/next.png"></A> <A NAME="tex2html10206"  HREF="node563.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node563.html"><IMG WIDTH="26" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="up" SRC="file:/usr/share/latex2html/icons/up.png"></A> <A NAME="tex2html10200"  HREF="node570.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node570.html"><IMG WIDTH="63" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="previous" SRC="file:/usr/share/latex2html/icons/prev.png"></A> <A NAME="tex2html10208"  HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html"><IMG WIDTH="65" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="contents" SRC="file:/usr/share/latex2html/icons/contents.png"></A> <A NAME="tex2html10210"  HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html"><IMG WIDTH="43" HEIGHT="24" ALIGN="BOTTOM" BORDER="0" ALT="index" SRC="file:/usr/share/latex2html/icons/index.png"></A> <BR><B> Next:</B> <A NAME="tex2html10213"  HREF="node572.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node572.html">41.1.9 Executing Tcl Procedures</A><B> Up:</B> <A NAME="tex2html10207"  HREF="node563.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node563.html">41.1 Nam Trace Format</A><B> Previous:</B> <A NAME="tex2html10201"  HREF="node570.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node570.html">41.1.7 Agent Tracing</A> &nbsp <B>  <A NAME="tex2html10209"  HREF="node1.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node1.html">Contents</A></B>  &nbsp <B>  <A NAME="tex2html10211"  HREF="node590.html" tppabs="http://www.isi.edu/nsnam/ns/doc/node590.html">Index</A></B> <!--End of Navigation Panel--><ADDRESS>2003-09-23</ADDRESS></BODY></HTML>

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