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Version:
4.4.5.dfsg-3ubuntu2 ▾
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<HTML>
<HEAD>
<TITLE>Contour level selection</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" TEXT="#000000">
<P><A NAME="contourlevels"></A>
<font size="+2" color="green">Contour level selection</font></P>
<P>
<TABLE border="1" cols="2" frame="box" rules="cols" width="608">
<TR>
<TD width="15%" valign="top"><B>Syntax</B>:</TD>
<TD width="85%" valign="top"><CODE>
CONTOUR { x y } z nctr { min { incr }}<br>
CONTOUR\SPECIFIC { x y } z lvls</CODE>
</TD></TR>
</TABLE>
<P>
By default, the number of contours,
<CODE><font color="blue">nctr</font></CODE>, must be provided.
If the increment is not specified, the actual number of contours drawn may not be the same as
the number that was asked for, since "nice" contour levels will be
selected and the range of values may not be neatly divisible by the
requested number. If the minimum is provided, but not the increment, a
"nice" value close to <CODE><font color="blue">min</font></CODE> will be
used instead of the actual data minimum. If the minimum and the increment
are both specified, those exact values will be used for the contour
levels.</P>
<P>
<font size="+1" color="green">Specific contour levels</font></P>
<P>
Specific contour levels can be requested by using the
<CODE><font color="blue">\SPECIFIC</font></CODE>
qualifier. In this case, the vector
<CODE><font color="blue">lvls</font></CODE> should contain the desired
contour levels.</P>
<P>
<font size="+1" color="green">Exact contour levels</font></P>
<P>
Exact contour levels can be requested in two ways.</P>
<UL>
<LI>Use the <CODE><font color="blue">\SPECIFIC</font></CODE> qualifier and
enter a vector containing the desired levels.</li>
<LI>Specify the minimum contour level, <CODE><font color="blue">min</font></CODE>, and the contour level
increment, <CODE><font color="blue">inc</font></CODE>. This produces a
set of equally spaced contour levels,<BR>
<CODE>[<font color="blue">min</font>; <font color="blue">min</font>+<font color="blue">inc</font>; <font color="blue">min</font>+2*<font color="blue">inc</font>; ...; <font color="blue">min</font>+<font color="blue">nctr</font>*<font color="blue">inc</font>]</CODE>.</li>
</UL>
<P>
<font size="+1" color="green">Zooming in</font></P>
<P>
When the user enters the number of contours but does not enter the contour level minimum and increment,
by default the entire range of data is used to find the minimum and maximum contour levels.
If the <CODE><font color="blue">\PARTIAL</font></CODE>
qualifier is used, the minimum and maximum contour levels will be
determined by the region contained within the axes. Thus, to zoom in on a
particular region for more detail, pre-set the axis scales, using the
<a href="Scales.htm"><CODE><font color="blue">SCALES</font></CODE></A>
command, before entering the <CODE><font color="blue">CONTOUR</font></CODE>
command. Of course, the <CODE><font color="blue">\PARTIAL</font></CODE>
qualifier does not apply when you request specific contour levels.</P>
<P>
<a href="Contour.htm"><img align="middle" border="0" src="../shadow_left.gif"> <font size="+1" color="olive">CONTOUR command</font></a><br>
<a href="ContourS02.htm"><img align="middle" border="0" src="../shadow_right.gif"> <font size="+1" color="olive">Contour line properties</font></a>
</P>
</body>
</html>