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<title>ploticus: program limitations</title>
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<td><br><h2>program limitations</h2></td>
<td align=right>
<small>
<a href="../doc/welcome.html"><img src="../doc/ploticus.gif" border=0></a><br>
Version 2.41 Mar2009
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<title>Manual page for program_limitations(PL)</title>
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<h2>System resource limitations</h2>
On Unix/linux, the default max amount of CPU time allowed is 30 seconds
which is enforced using setrlimit(), and a core dump occurs when
the limit is exceeded. This limit may be modified by using
<a href="settings.html">
proc settings,
</a>
or in your
<a href="config.html">
config file
</a>
or by directly modifying pl.h (CPULIMIT)
<br><br><br>
<h2>Date arithmetic</h2>
The date arithmetic package can handle dates as far back as 1754.<tt> </tt>
Date scaling using omitweekends mode is not supported (and gives incorrect results) for dates
before Jan 1, 1970.<tt> </tt>
<br><br><br>
<h2>Capacity limits</h2>
Ploticus has these capacity limitations. Many of them are actually dynamic and
can be overridden using command line arguments (etc).<tt> </tt>
Unless otherwise noted these are #defined in <tt>pl.h</tt> or <tt>tdhkit.h</tt>
(the relevant <tt>#define</tt> is shown in parentheses)
and can be safely raised if necessary (then do: <tt>make clean; make</tt>).<tt> </tt>
<br><br>
<p>
<b>Data</b>
<br><br>
<ul>
<li>
Default max number of data rows: 10,000 rows (MAXDROWS).<tt> </tt>
This limit is dynamic and can be raised using command line option <tt>-maxrows</tt>.<tt> </tt>
<br><br>
<li>
Default max total number of individual data fields: 200,000 fields (MAXD).<tt> </tt>
This is the number of data fields per row, times number of rows.
It is used to allocate storage for pointers, one per data item.<tt> </tt>
This limit is dynamic and can be raised using command line option <tt>-maxfields</tt>.<tt> </tt>
<br><br>
<li>
Default maximum number of elements in the data vector: 100,000. The "data vector" is used by proc processdata
median computation (1 element per data point); proc lineplot, scatterplot, and curvefit (2 elements
per data point); and proc rangesweep (3 elements per data point).<tt> </tt>
This limit is dynamic and can be raised using command line option <tt>-maxvector</tt>.<tt> </tt>
<br><br>
<li>
<b>Example:</b> suppose you have a data set with 58,000+ rows, and each row has 10 fields.<tt> </tt>
You are doing scatterplots, so the plotting vector requires 2
⋅
58,000 cells.
You would set capacities like this:
<br>
<tt>pl ... -maxrows 60000 -maxfields 600000 -maxvector 120000</tt>
<br><br>
<li>
Max length of data field: 250 chars
(DATAMAXLEN)
<br><br>
<li>
Max length of input data record: 2998 chars
(MAXRECORDLEN)
<br><br><br>
</ul>
<p>
<b>Scripts</b>
<br><br>
<ul>
<li>
Default maximum total number of lines in currently active procs: 5000 lines (MAXPROCLINES).<tt> </tt>
This limit is dynamic and can be raised using command line option <tt>-maxproclines</tt>.<tt> </tt>
"Currently active procs" are the current proc, any <tt>#saved</tt> procs, and any <b>proc getdata</b>
having an embedded <tt>data:</tt> statement. The maximum number of "currently active procs" is 40 (MAXOBJ)
<br><br>
<li>
Max length of a line in a ploticus script: 3000 chars before & after variable evaluation
(SCRIPTLINELEN)
<br><br>
<li>
Max number of variables: 200
(MAXVAR)
<br><br>
<li>
Max length of variable contents: 250 chars
(VARMAXLEN)
<br><br>
<li>
Max length of field names, variable names, category names, proc & attribute names: 48 chars
(NAMEMAXLEN)
<br><br><br>
</ul>
<p>
<b>Other</b>
<br><br>
<ul>
<li>
Max length of a file pathname is generally 250 characters.<tt> </tt>
<br><br>
<li>
Default max number of scale categories in X: 250; in Y: 250
(MAXNCATS).<tt> </tt>
This limit is dynamic and can be overridden using
<a href="categories.html">
proc categories listsize attribute
</a>
<br><br>
<li>
Max number of points from which to compute a moving average or regression curve in proc curvefit is 1000 points, a
dynamic limit that can be raised by specifying proc curvefit's maxinpoints attribute, or by raising MAXPTS in proc_curvefit.c
<br><br>
<li>
Max number of points from which to compute a bspline curve is 100 points (see proc_curvefit.c).<tt> </tt>
<br><br>
<li>
Max number of pie graph slices: 80
<br><br>
<li>
proc tabulate limits: 200 rows, 200 columns, 200 ranges, comparison significance is 38 characters.<tt> </tt>
(see proc_tabulate.c)
<br><br>
<li>
Max length of a color specification: 38 chars.<tt> </tt>
<br><br>
<li>
Under X11, SWF, and PNG/GIF/JPEG there's a limit of 500 points for a polygon
(filled lineplots and rangesweeps are made up of many 4-sided polygons, so this
limit doesn't apply to these), and with SWF there's a limit of 500 points for any one continuous line.<tt> </tt>
Can be raised using command line option <tt>-maxdrawpoints</tt>.<tt> </tt>
<br><br>
<li>
In proc lineplot, there's a maximum of 200 data points that can use the alternative data point symbol.<tt> </tt>
(in versions prior to 2.33 the limit is 100)
<br>
<br>
</td></tr>
<td align=right>
<a href="../doc/welcome.html">
<img src="../doc/ploticus.gif" border=0></a><br><small>data display engine <br>
<a href="../doc/Copyright.html">Copyright Steve Grubb</a>
<br>
<br>
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<img src="../gallery/all.gif">
</center>
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<table><tr><td>
Ploticus is hosted at http://ploticus.sourceforge.net</td><td> </td><td>
<a href="http://sourceforge.net/projects/ploticus"><img src="http://sflogo.sourceforge.net/sflogo.php?group_id=38453&type=12"
width="120" height="30" border="0"
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