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Renamed from 0BUGS. · gnuplot/gnuplot-old@53d8aeb · GitHub

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‎BUGS‎

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1. The hidden line algorithm is not perfect. We have put in an option
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to draw both sides of the surface in the same linetype, thus avoiding
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this problem completely. We should put in an option of not drawing
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the back at all.
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2. In the Atari version, windows are not currently supported. This
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means gnuplot 3.4 will not run with MultiAES. We hope to correct
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this shortly in gpcontrb.tar.z.
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[Status of this bug: unknown]
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3. autoscale writeback is probably broken. One problem is that
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the range is written back before the range is extented to a
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whole number of tics. eg if data is 0.9->10.1, that is what
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gets written back, but the plot is 0 -> 11. If autoscale
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is switched off, you do get 0.9->10.1 since switching off
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autoscale switches off the extend-to-tic-multiple stuff.
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Also, writeback with log scales writes back the log of the min/max
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[Status: unknown]
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4. m[]tics bug when plotting time data
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There is an initialization problem when plotting time data with an
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interval calculation; an inordinate number of m[]tics are automatically
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drawn, e.g.,
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set xdata time; set ydata time
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set timefmt "%d/%m"
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set format x "%b %d"
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set xrange ["01/12":"06/12"]
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set xtics "01/12", 172800, "05/12"
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plot x
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The problem can be avoided by initializing via a plot before the
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interval calculation:
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[...]
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set xrange ["01/12":"06/12"]
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plot x
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set xtics "01/12", 172800, "05/12"
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plot x
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5. "\n" does not work in the format for the tics in splot
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6. Error bars don't work in polar plots
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7. arrows and labels are not clipped (2D and 3D)
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8. contour line clipping of 3D data plots
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The following tips for plotting contours were kindly supplied by Don Taber
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<dtaber@blackrat.risc.rockwell.com> and Paul Halsema <phalsema@harris.com>.
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Splotting gives little control over the appearance of contour lines.
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You can do a better job by extracting the contours with the table
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terminal and then plotting the resulting file. You should 'set
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nosurface' to eliminate the surface isolines from the file generated
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by the table terminal.
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All the contours will be written to a single file. To plot them with
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different line styles, you can use one of several approaches. The
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simplest is to use the 'index' feature. This has the advantage of
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using only gnuplot internals. Other approaches use a utility
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such as sed, awk, or perl to either break up the file or generate
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a more sophisticated command file for plotting it.
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The following gnuplot script extracts circular contours from a
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paraboloid of revolution and plots the resulting file. It then
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uses 'index' to provide different linestyles. Finally, it runs
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an awk script to generate a command file for plotting the file.
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set cntrparam levels discrete 20, 40, 60
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set contour base
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set nosurface
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splot x**2 + y**2
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set term table
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set output 'circles'
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replot
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set term linux # or whatever your original term was
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set output
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plot 'circles' # all one linestyle
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plot 'circles' index 0 t '20', 'circles' index 1 t '40', 'circles' index 2 t '60' # different linestyles
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!awk -f contr.awk circles > circles.gnu
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load 'circles.gnu'
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Where the gawk script (contr.awk) contains the following:
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#!/usr/bin/nawk -f
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# ^---Replace with your favorite variant
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# courtesy of Paul Halsema (phalsema@harris.com)
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# and Emmanuel Bigler <bigler@jsbach.univ-fcomte.fr>
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#
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# This script operates on a file generated by a gnuplot splot command with
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# a table terminal type. The output should be redirected to another file
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# which can then be loaded into gnuplot. This results in a contour plot
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# that is more appealing for presentation purposes. Providing the optional
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# parameter n will put a label on the contour at every nth point.
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#
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# Sample usage (in gnuplot):
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# !nawk -f contr.awk -v n=12 circles > circles.gnu
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# load 'circles.gnu'
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#
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# If you make this script executable and place it somewhere in your path,
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# then it can be called directly as in:
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#
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# !nawk -f contr.awk -v n=12 circles > circles.gnu
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# load 'circles.gnu'
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BEGIN {
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fmt1="%s \\\n index %d title '%s'";
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fmt2="%s, \\\n '' index %d title '%s'";
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# Add any gnuplot commands that you always want performed here
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print "set key out";
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print "set key title '" FILENAME "'";
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print "set data style lines";
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print
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# End of general commands section
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pltcmd="plot '"FILENAME"'";
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}
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{
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# Generate a fragment of the plot command for each contour
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if ($2=="Contour")
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{
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split($3,indx,",");
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titl=$5;
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if ($3=="0,") { pltcmd=sprintf(fmt1, pltcmd, indx[1], titl); }
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else { pltcmd=sprintf(fmt2, pltcmd, indx[1], titl); }
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}
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# Add labels at every nth point along a contour
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if( (n!=0) && ($0 !~ /^\#/) && ($0 !~ /^$/) && ((NR%n)==1))
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{printf("set label '%s' at %f,%f center\n",$3,$1,$2);}
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}
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END {
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# Write out the entire plot command
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printf "\n%s\n", pltcmd;
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}
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9. There is an initialization problem of when plotting time data with an
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interval calculation; an inordinate number of m[]tics are automatically
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drawn, e.g.,
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set xdata time; set ydata time
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set timefmt "%d/%m"
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set format x "%b %d"
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set xrange ["01/12":"06/12"]
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set xtics "01/12", 172800, "05/12"
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plot x
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The problem can be avoided by initializing via a plot before the
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interval calculation:
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[...]
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set xrange ["01/12":"06/12"]
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plot x
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set xtics "01/12", 172800, "05/12"
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plot x
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10. (Not really a bug)
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Terminal drivers which are accompanied by external executables
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could cause some trouble: their subprocesses (started by fork() e.g.)
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may inherit handles to open file(s) from the main process.
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If the filesystem doesn't allow deleting open files these file are
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locked for the time the terminal driver is running.
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11. OS/2 gcc optimiser bug
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The following gnuplot commands demonstrate a bug in gcc's optimiser
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under OS/2. The workaround is to use "-O2 -ffloat-store" instead of "-O2".
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reset
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set key
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set xlabel "Year"
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set xdata time
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set timefmt "%y%m%d"
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set format x "%y"
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set xrange ["900621" : "950126"]
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set ylabel "Price per $100 principal"
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plot '-' using 1:2 title 'Fitted IO' with lines 1
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900621 20
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950126 55
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e
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12. compiling help file with Visual C++ 4.0/Windows NT
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The help compiler is unable to compile gnuplot.rtf, possibly because
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it cannot handle the new RTF spec. There is no workaround, but
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VC++ 5.0/6.0 users should have no problems.
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13. The 16bit Windows version, compiled by Borland C++ 3.1, crashes with
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a protection violation in 'all.dem', on the first plot that tries
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to read a datafile. Heap corruption suspected.
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(Moved from old WhatsNew file, needs cleaning up)
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BUGS outstanding
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illegal trailing tab on fig output
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minor tics missing on HPUX ?
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terminal settings get propagated when terminal is changed (now fixed ?)
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set ?range [] writeback is broken for logscales.
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source file copyrights are out of date - what should go on new files ?
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to be documented - ms-windows cannot do wide, dashed lines (well, win32 can,
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but...)
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