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Strange result using plot


From: José Luis García Pallero
Subject: Strange result using plot
Date: Tue, 20 Feb 2007 16:42:19 +0100

Hi,
I'm plotting a geodetic network and the plot command backs a strange result. I must plot a lot of lines and I use the plot command in the form:

hold on;
for i=1:rows
    plot([xStart xEnd],[yStart yEnd],'g');
end

When the loop arrives about i=100 this message appears on the screen:

gnuplot> pl '/tmp/oct-z3fdsP' u ( $ 1 ) :( $ 2 )  t "" w points 3 6  , '/tmp/oct-oh3bIP' u ( $ 1 ) :( $ 2 )  t "" w points 1 4  , '/tmp/oct-JbCW5P' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-qVDdwQ' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-nfEEPQ' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-eIgybR' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-xdN3IR' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-kKS6iS' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-PB9bRS' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-y4dZiT' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-N3kHZT' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-cAgUIU' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-VQ45pV' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-QDmI0V' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-tN8TDW' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-qPLXsX' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-NMpykY' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-ABsB5Y' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-JfYaTZ' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-Wj21R0' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-TNRsT1' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-8YiSS2' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-P4pKL3' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-MQa8G4' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-v9zaO5' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-q24HX6' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-NPfI07' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-CDLw68' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-7OSTIc' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-CirKng' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-N3TC0j' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-oGLXwn' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-9lKIir' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-cJAI6u' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-Tk4JSy' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-ImtbyC' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-BMR6fG' u ( $FA' 1 ) :( $ 2 )  t "" w lines 2
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          ^
         line 0: invalid character

It's a very strange text!
The message appears about every 100 times index. In my case, the next message was:

gnuplot> pl '/tmp/oct-Evyc1o' u ( $ 1 ) :( $ 2 )  t "" w points 3 6  , '/tmp/oct-I2LXa4' u ( $ 1 ) :( $ 2 )  t "" w points 1 4  , '/tmp/oct-A9E7rJ' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-e9XaLo' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-K8WkX3' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-6ykZaJ' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-Wym7zo' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-Czpq13' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-sZyBlJ' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-oOVZHo' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-o5TWf4' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-E0s8PJ' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-8oDVip' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-kGAd14' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-CmLILK' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-2qOmpq' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-E5Wv55' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-g45VWL' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-6BvjQr' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-QcSNC7' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-Av34qN' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-qh4Dqt' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-qyQqs9' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-mXTBnP' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-GcE2kv' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-QuYrtb' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-YZp3DR' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-Qku1Hx' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-M1ucOd' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-UKL4JR' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-cZNaIv' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-GHgqz9' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-ucVbtN' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-gYieyr' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-YRtbF5' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-wI3eFJ' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-ojMxHn' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-CNzrV1' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-gblBbG' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-GpXQkk' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-2Lm1vY' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-IWwvSC' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-mmRshh' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-OFjwzV' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-IZSa7z' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-unK0Ge' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-Ar809S' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-CHpuFx' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-GkYemc' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-Me9U4Q' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-6BVcGv' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-cWdWja' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-oJlX8O' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-uBZSZt' u ( $ 1 ) :( $ 2 )  t "" w lines 2  , '/tmp/oct-WcrZJ8' u ( $ 1 ) :( $ 2 )  ty�A9! "" w lines 2
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          ^
         line 0: invalid character

         line 0: undefined variable: set

It's bigger than the first time and in this case appears the string: line 0: undefined variable: set
But the plot is right, there is no errors in the execution of the script. In Octave 2.1.73 with gnuplot and with octplot the messages not appears, only in Octave 2.9.9 compiled for my machine (no errors ocurred during compilation)

Can anybody help me, please?

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José Luis García Pallero
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