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Groups > comp.graphics.apps.gnuplot > #587

Re: plot using lines wraps around

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On Sep 15, 11:03 pm, dom for <ddom...@gmail.com> wrote:
> I'm plotting using the following command:
> plot "$p" using 2:6 title "IOPS" with lines lt 3 axes x1y1, \
> "$p" using 2:9 title "Service Time" with lines lt 4 axes x1y2
>
> The plot seems to create a line from the last entry to the first entry
> as if it continued from the first entry again. The complete gnuplot
> commands are as follows:
>
> #
> set datafile separator " "
> set terminal png small size $W,$H
> set output "$HOSTNAME/$PNG_PATH/sa$day_name.2.$device.multiplot.png"
> show output
> set multiplot layout 2, 1 scale 0.99,1.3 #0.95,1.3
> #set format x ""
> #show format
> unset xtics
> unset xlabel
> set size 1.0,0.55
> set style data lines
> set title "Disk IOPS vs Service Time, for Day => $day_name, for device
> => $device" tc lt 3
> set ylabel "IOPS" tc lt 3
> set y2label "msec" tc lt 4
> set autoscale y
> set autoscale x
> set autoscale y2
> set yrange [0:*]
> set y2range [0:*] noreverse writeback
> set grid
> set xdata time
> set timefmt "%H:%M:%S"
> set format x "%H:%M"
> set xrange [*:*]
> set xtics border norotate
> set ytics axis norotate
> set ytics textcolor lt 3
> set y2tics textcolor lt 4
> set xtics nomirror font "Arial,8" tc rgbcolor "blue"
> set ytics nomirror font "Arial,8" tc rgbcolor "blue"
> set bmargin 6
> #show format
> show title
> set style data histogram
> set style histogram rowstacked
> plot "$p" using 2:6 title "IOPS" with lines lt 3 axes x1y1, \
> "$p" using 2:9 title "Service Time" with lines lt 4 axes x1y2
>
> unset label
> unset y2range
> unset y2tics
> unset y2label
> unset object 1
> set key autotitle columnheader
> set object 2 rect from graph 0.01,-0.01 to graph 1.01,0.99 behind fc
> rgb "#333333" fillstyle transparent noborder
> set label 3 "Max Busy = %6.0f", tmaxbusy at graph 0.1,0.9 front font
> "Arial,8" tc lt 2
> set timestamp
> set title "Disk Busy, for Day => $day_name, for device => $device" tc
> lt 2
> set xlabel "Time" font "Arial,8" tc rgbcolor "blue"
> set xdata time
> set format x "%H:%M"
> set xtics border norotate
> set ytics textcolor lt 2
> set ytics nomirror
> set autoscale y
> set origin 0.0,0.0
> set size 1.0,0.55
> set yrange [0:100]
> set ylabel "% Busy" tc lt 2
> set rmargin 9
> show title
> plot "$p" using 2:4 title "Busy" with lines lt 2 axes x1y1
>
> unset multiplot
>
> Any ideas as to what I'm doing wrong that would cause the plot to
> wrap?
>
> I'm using:
>
> G N U P L O T
> Version 4.4 patchlevel 0
> last modified March 2010
> System: SunOS 5.10
>
> On Solaris for SPARC.
>
> Thanks,
> Dom
>
> sample output is here:http://sourceforge.net/tracker/download.php?group_id=2055&atid=202055...
>
> sample data:
> 2011-09-01 00:05:00 sd0 0 0.0 0 6 0.0 28.0
> 2011-09-01 00:10:00 sd0 0 0.0 0 7 0.0 24.8
> 2011-09-01 00:15:00 sd0 0 0.0 1 16 0.0 25.6
> 2011-09-01 00:20:00 sd0 0 0.0 0 6 0.0 23.9
> 2011-09-01 00:25:00 sd0 0 0.0 0 7 0.0 25.3
> 2011-09-01 00:30:00 sd0 0 0.0 1 15 0.0 25.0
> 2011-09-01 00:35:00 sd0 0 0.0 1 19 0.0 24.8
> 2011-09-01 00:40:00 sd0 0 0.0 0 7 0.0 25.5
> 2011-09-01 00:45:00 sd0 0 0.0 1 8 0.0 25.3
> 2011-09-01 00:50:00 sd0 0 0.0 0 6 0.0 26.0
> 2011-09-01 00:55:00 sd0 0 0.0 0 7 0.0 24.5
> 2011-09-01 01:00:01 sd0 0 0.0 1 8 0.0 24.6

I can't reproduce the problem with the data and commands you've posted
(in fact I had to modify the commands to get them to run).

An idea why the graph may appear to wrap around:
You use "%H:%M:%S" as the time format, which means that you ask
gnuplot to ignore the date part of the time stamp. If your data spans
more than one days, then the moment of the day change (or simply,
midnight) appears as a jump to the start of the graph, since gnuplot
thinks it's the same day.
Setting the time format to "%Y/%m/%d %H:%M:%S might solve the problem:
that way the full time stamp will be read in.

Péter Juhász

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plot using lines wraps around dom for <ddomm56@gmail.com> - 2011-09-15 14:03 -0700
  Re: plot using lines wraps around Péter Juhász <peter.juhasz83@gmail.com> - 2011-09-17 06:00 -0700

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