1<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 3//EN"> 2<HTML><HEAD> 3 <TITLE>User's Reference - Trace</TITLE> 4 <META HTTP-EQUIV="keywords" CONTENT="GRAPHICS VISUALIZATION VISUAL PROGRAM DATA 5MINING"> 6 <meta http-equiv="content-type" content="text/html;charset=ISO-8859-1"> 7</HEAD><BODY BGCOLOR="#FFFFFF" link="#00004b" vlink="#4b004b"> 8 <TABLE width=510 border=0 cellpadding=0 cellspacing=0> 9 <TR> 10 <TD><IMG src="../images/spacer.gif" width=80 height=1></TD> 11 <TD><IMG src="../images/spacer.gif" width=49 height=1></TD> 12 <TD><IMG src="../images/spacer.gif" width=24 height=1></TD> 13 <TD><IMG src="../images/spacer.gif" width=100 height=1></TD> 14 <TD><IMG src="../images/spacer.gif" width=3 height=1></TD> 15 <TD><IMG src="../images/spacer.gif" width=127 height=1></TD> 16 <TD><IMG src="../images/spacer.gif" width=6 height=1></TD> 17 <TD><IMG src="../images/spacer.gif" width=50 height=1></TD> 18 <TD><IMG src="../images/spacer.gif" width=71 height=1></TD> 19 </TR> 20 <TR> 21 <TD colspan=9><IMG src="../images/flcgh_01.gif" width=510 height=24 alt="OpenDX - Documentation"></TD> 22 </TR> 23 <TR> 24 <TD colspan=2><A href="../allguide.htm"><IMG src="../images/flcgh_02.gif" width=129 height=25 border="0" alt="Full Contents"></A></TD> 25 <TD colspan=3><A href="../qikguide.htm"><IMG src="../images/flcgh_03.gif" width=127 height=25 border="0" alt="QuickStart Guide"></A></TD> 26 <TD><A href="../usrguide.htm"><IMG src="../images/flcgh_04.gif" width=127 height=25 border="0" alt="User's Guide"></A></TD> 27 <TD colspan=3><B><A href="../refguide.htm"><IMG src="../images/flcgh_05d.gif" width=127 height=25 border="0" alt="User's Reference"></A></B></TD> 28 </TR> 29 <TR> 30 <TD><A href="refgu157.htm"><IMG src="../images/flcgh_06.gif" width=80 height=17 border="0" alt="Previous Page"></A></TD> 31 <TD colspan=2><A href="refgu159.htm"><IMG src="../images/flcgh_07.gif" width=73 height=17 border="0" alt="Next Page"></A></TD> 32 <TD><A href="../refguide.htm"><IMG src="../images/flcgh_08.gif" width=100 height=17 border="0" alt="Table of Contents"></A></TD> 33 <TD colspan=3><A href="refgu009.htm"><IMG src="../images/flcgh_09.gif" width=136 height=17 border="0" alt="Partial Table of Contents"></A></TD> 34 <TD><A href="refgu175.htm"><IMG src="../images/flcgh_10.gif" width=50 height=17 border="0" alt="Index"></A></TD> 35 <TD><A href="../srchindx.htm"><IMG src="../images/flcgh_11.gif" width=71 height=17 border="0" alt="Search"></A></TD> 36 </TR> 37 </TABLE> 38 <H3><A name="HDRTRACE" ></A>Trace</H3> 39 <A NAME="IDX745"></A><A NAME="IDX746"></A> 40<P><STRONG>Category</STRONG> 41<P> 42<A HREF="refgu008.htm#HDRCATDBG">Debugging</A> 43<P><STRONG>Function</STRONG> 44<P> 45Enable or disables tracing options. 46<P><STRONG>Syntax</STRONG> 47<PRE> 48Trace(<STRONG>what, how</STRONG>); 49</PRE> 50<P><STRONG>Inputs</STRONG> 51<BR> 52<TABLE BORDER> 53<TR> 54<TH ALIGN="LEFT" VALIGN="TOP" WIDTH="20%">Name 55</TH><TH ALIGN="LEFT" VALIGN="TOP" WIDTH="20%">Type 56</TH><TH ALIGN="LEFT" VALIGN="TOP" WIDTH="20%">Default 57</TH><TH ALIGN="LEFT" VALIGN="TOP" WIDTH="40%">Description 58</TH></TR><TR> 59<TD ALIGN="LEFT" VALIGN="TOP" WIDTH="20%"><TT><STRONG>what</STRONG></TT> 60</TD><TD ALIGN="LEFT" VALIGN="TOP" WIDTH="20%">string 61</TD><TD ALIGN="LEFT" VALIGN="TOP" WIDTH="20%">none 62</TD><TD ALIGN="LEFT" VALIGN="TOP" WIDTH="40%">the object to be traced 63</TD></TR><TR> 64<TD ALIGN="LEFT" VALIGN="TOP" WIDTH="20%"><TT><STRONG>how</STRONG></TT> 65</TD><TD ALIGN="LEFT" VALIGN="TOP" WIDTH="20%">integer 66</TD><TD ALIGN="LEFT" VALIGN="TOP" WIDTH="20%">1 67</TD><TD ALIGN="LEFT" VALIGN="TOP" WIDTH="40%">0: set tracing off 68<BR> 691: set tracing on 70</TD></TR></TABLE> 71<P><STRONG>Functional Details</STRONG> 72<P> 73<TABLE CELLPADDING="3"> 74<TR VALIGN="TOP"><TD><P><B><TT><STRONG>what</STRONG></TT> 75</B></TD><TD><P>is (1) a keyword specifying the object to be traced <I>or</I> 76(2) a set of letters specifying a group 77of debug message classes, as used by the 78<TT><STRONG>DXEnableDebug()</STRONG></TT> 79library function (see <I>IBM Visualization Data Explorer Programmer's 80Reference</I>). 81<P> 82At present, the only keyword value allowed for this parameter is 83<TT><STRONG>"time"</STRONG></TT>: 84<TT><STRONG>Trace("time", 1);</STRONG></TT> will begin the trace, and 85<TT><STRONG>Trace("time", 0);</STRONG></TT> will print a record of time use 86since the tracing was started. 87The output appears in the Message window. 88<BR> 89If <TT><STRONG>what</STRONG></TT> is a string of lowercase letters other than 90<TT><STRONG>time</STRONG></TT>, the module calls the 91<TT><STRONG>DXEnableDebug</STRONG></TT> library 92function. 93(The uppercase letters A-Z and the numbers 0-9 are reserved 94for system use). 95</TD></TR><TR VALIGN="TOP"><TD><P><B><TT><STRONG>how</STRONG></TT> 96</B></TD><TD><P>specifies whether the trace option is activated or not. 97</TD></TR></TABLE> 98<P><B>Note: </B>If the executive is started with the flag <TT>-timing</TT> on, 99the command <TT>Trace("time", 0)</TT> causes all module 100entry and exit times to be printed. 101In the VPE window, this command can be 102 103enabled using the Debug Tracing button 104in the <TT><STRONG>Commands</STRONG></TT> menu of the 105 106Message window (see 107<A HREF="usrgu046.htm#HDRDEBUG">8.2 , "Using the Message Window"</A> in <I>IBM 108Visualization Data Explorer User's Guide</I>). 109<P><STRONG>Script Language Example</STRONG> 110<P> 111In this example, the module traces the use of time by Isosurface. 112<PRE> 113electrondensity = Import("/usr/local/dx/samples/data/watermolecule"); 114electrondensity = Partition(electrondensity); 115camera = AutoCamera(electrondensity, width=5); 116Trace("time", 1); 117isosurface = Isosurface(electrondensity, 0.3); 118Trace("time", 0); 119Display(isosurface, \camera); 120</PRE> 121<P><STRONG>See Also</STRONG> 122<P> 123 <A HREF="refgu166.htm#HDRUSAGE">Usage</A> 124 <P> 125 <HR> 126 <DIV align="center"> 127 <P><A href="../allguide.htm"><IMG src="../images/foot-fc.gif" width="94" height="18" border="0" alt="Full Contents"></A> <A href="../qikguide.htm"><IMG src="../images/foot-qs.gif" width="94" height="18" border="0" alt="QuickStart Guide"></A> <A href="../usrguide.htm"><IMG src="../images/foot-ug.gif" width="94" height="18" border="0" alt="User's Guide"></A> <A href="../refguide.htm"><IMG src="../images/foot-ur.gif" width="94" height="18" border="0" alt="User's Reference"></A></P> 128 </DIV> 129 <DIV align="center"> 130 <P><FONT size="-1">[ <A href="http://www.research.ibm.com/dx">OpenDX Home at IBM</A> | <A href="http://www.opendx.org/">OpenDX.org</A> ] </FONT></P> 131 <P></P> 132 </DIV> 133 <P></P> 134 </BODY></HTML> 135
