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Groups > comp.graphics.apps.gnuplot > #1918

Re: Please help - plot image not working

Newsgroups comp.graphics.apps.gnuplot
Date 2013-06-25 20:53 -0700
References <e748d557-b03b-48de-b031-d3b52eedf0ce@googlegroups.com>
Message-ID <732cae3a-d6c5-4ec0-bed8-5fce5e17eca4@googlegroups.com> (permalink)
Subject Re: Please help - plot image not working
From Sree <sreejithpk@gmail.com>

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On Tuesday, June 25, 2013 12:27:42 PM UTC+3, Sree wrote:
> Hello group,
> 
> 
> 
> 
> 
> I have a data matrix in a file. The data is comma separated and looks like (i do not know how to attach a file to the post):
> 
> 
> 
> 32.71615219116211,32.35625839233398,31.498046875,30.73119926452637,30.77080345153809,31.56380462646484,32.03682327270508,33.60488128662109,33.0875358581543,33.42950439453125,32.52166366577148,33.06188201904297,33.81738662719727,33.58745956420898,33.51096343994141,32.37562942504883,32.29684448242188,31.98270416259766,32.52191543579102,32.67719268798828,32.59981536865234,32.91101837158203,33.16838073730469,32.82643508911133,31.57819938659668,31.00910568237305,31.31731414794922,29.89642333984375,32.47930908203125,32.2718505859375,33.17678833007812,32.15474700927734,33.08844375610352,-inf,-inf,-inf
> 
> 34.66389846801758,34.15962982177734,33.09500503540039,31.83910942077637,31.35856437683105,32.72917175292969,33.30414199829102,34.22311401367188,33.47836303710938,32.94600677490234,33.19053268432617,34.06565093994141,34.55643081665039,34.12158203125,34.16344833374023,33.06776809692383,33.35759353637695,32.38563919067383,32.79897308349609,32.89970397949219,33.78991317749023,32.83514785766602,32.41145324707031,32.71649169921875,31.50583457946777,31.1647777557373,31.491943359375,30.10324096679688,32.18594360351562,32.05590057373047,31.88617134094238,31.39592742919922,31.54354286193848,31.09903907775879,32.32763290405273,33.10724258422852,34.64406585693359,35.16285705566406,32.22066 .....
> 
> .......
> 
> 
> 
> 
> 
> I am trying to plot an image with the following command:
> 
> 
> 
> gnuplot> set datafile separator ','
> 
> gnuplot> plot 'data.txt' matrix using (0+column(1)*1.6384):(-6.0+column(2)*6.256021):(column(3)) with image
> 
> 
> 
> 
> 
> but it is producing an empty plot with the warning:
> 
> 
> 
> warning: Image grid must be at least 2 x 2.
> 
> warning: Image grid must be at least 2 x 2.
> 
> 
> 
> 
> 
> the same data, i tried to plot in a different computer (computer 2) and then it works fine with same set of commands. My question is what is going wrong in the first case. is it the gnuplot version or something else. 
> 
> The following is the gnuplot versions.
> 
> 
> 
> where the plot command doesn't work (computer 1):
> 
> gnuplot> show version long
> 
> 
> 
>         G N U P L O T
> 
>         Version 4.6 patchlevel 3    last modified 2013-04-12
> 
>         Build System: Linux x86_64
> 
> 
> 
>         Copyright (C) 1986-1993, 1998, 2004, 2007-2013
> 
>         Thomas Williams, Colin Kelley and many others
> 
> 
> 
>         gnuplot home:     http://www.gnuplot.info
> 
>         faq, bugs, etc:   type "help FAQ"
> 
>         immediate help:   type "help"  (plot window: hit 'h')
> 
> Compile options:
> 
> -READLINE  +LIBREADLINE  +HISTORY
> 
> -BACKWARDS_COMPATIBILITY  +BINARY_DATA
> 
> +GD_PNG  +GD_JPEG  +GD_TTF  +GD_GIF  +ANIMATION
> 
> -USE_CWDRC  +X11  +X11_POLYGON  +MULTIBYTE  +X11_EXTERNAL +USE_MOUSE  +HIDDEN3D_QUADTREE
> 
> +DATASTRINGS  +HISTOGRAMS  +OBJECTS  +STRINGVARS  +MACROS  +IMAGE  +USER_LINETYPES +STATS
> 
> 
> 
> GNUPLOT_DRIVER_DIR = "/usr/local/libexec/gnuplot/4.6"
> 
> GNUPLOT_PS_DIR     = "/usr/local/share/gnuplot/4.6/PostScript"
> 
> HELPFILE           = "/usr/local/share/gnuplot/4.6/gnuplot.gih"
> 
> 
> 
> Computer 1: Red Hat Enterprise Linux Server release 6.3 (Santiago)
> 
> 
> 
> 
> 
> 
> 
> 
> 
> where I can plot the image with the same commands (computer 2)
> 
> gnuplot> show version long
> 
> 
> 
>     G N U P L O T
> 
>     Version 4.7 patchlevel 0    last modified 2013-05-12
> 
> 
> 
>     Copyright (C) 1986-1993, 1998, 2004, 2007-2012
> 
>     Thomas Williams, Colin Kelley and many others
> 
> 
> 
>     gnuplot home:     http://www.gnuplot.info
> 
>     mailing list:     gnuplot-beta@lists.sourceforge.net
> 
>     faq, bugs, etc:   type "help FAQ"
> 
>     immediate help:   type "help"  (plot window: hit 'h')
> 
> Compile options:
> 
> +READLINE  -LIBREADLINE  +HISTORY 
> 
> -BACKWARDS_COMPATIBILITY  +BINARY_DATA 
> 
> +GD_PNG  +GD_JPEG  +GD_TTF  +GD_GIF  +ANIMATION 
> 
> -USE_CWDRC  +X11  +X11_POLYGON  +MULTIBYTE  +X11_EXTERNAL +USE_MOUSE  +HIDDEN3D_QUADTREE 
> 
> +DATASTRINGS  +HISTOGRAMS  +OBJECTS  +STRINGVARS  +MACROS  +IMAGE  +USER_LINETYPES +STATS
> 
> 
> 
> GNUPLOT_DRIVER_DIR = "/usr/local/libexec/gnuplot/4.7"
> 
> GNUPLOT_PS_DIR     = "/usr/local/share/gnuplot/4.7/PostScript"
> 
> HELPFILE           = "/usr/local/share/gnuplot/4.7/gnuplot.gih"
> 
> 
> 
> Computer 2: Ubuntu 12.04.2 LTS
> 
> 
> 
> Any help is appreciated.
> 
> Thanks
> 
> Sree


To investigate it further  I made a simple data1.txt, that now looks like this:

32.71615219116211,32.35625839233398,31.498046875,30.73119926452637,30.77080345153809,31.56380462646484,-inf,-inf
34.66389846801758,34.15962982177734,33.09500503540039,31.83910942077637,31.35856437683105,32.72917175292969,-inf,-inf
34.74748992919922,34.45933151245117,34.7545051574707,33.43788146972656,33.15143203735352,33.85923767089844,-inf,-inf
34.74748992919922,34.45933151245117,34.7545051574707,33.43788146972656,33.15143203735352,33.85923767089844,-inf,-inf

gnuplot> set datafile separator ','
gnuplot>  plot 'data1.txt' matrix using (column(1)):(column(2)):(column(3)) with image
warning: Image grid must be at least 2 x 2.
warning: Image grid must be at least 2 x 2.

but instead if i use the commands below, it is working and producing an image:
gnuplot> set datafile separator ','
gnuplot>  plot 'data1.txt' matrix using 1:2:3 with image

so what could be going wrong in the first case? perhaps the way the 'column' is used? any idea?

Thanks
Sree

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Thread

Please help - plot image not working Sree <sreejithpk@gmail.com> - 2013-06-25 02:27 -0700
  Re: Please help - plot image not working Sree <sreejithpk@gmail.com> - 2013-06-25 19:59 -0700
  Re: Please help - plot image not working Sree <sreejithpk@gmail.com> - 2013-06-25 20:53 -0700
    Re: Please help - plot image not working Karl <mail.kfr@gmx.net> - 2013-06-26 07:49 +0200
  Re: Please help - plot image not working Sree <sreejithpk@gmail.com> - 2013-06-26 00:15 -0700
    Re: Please help - plot image not working Karl <mail.kfr@gmx.net> - 2013-06-27 07:27 +0200
  Re: Please help - plot image not working Sree <sreejithpk@gmail.com> - 2013-07-02 23:39 -0700
    Re: Please help - plot image not working Christoph Bersch <usenet@bersch.net> - 2013-07-03 09:21 +0200
      Re: Please help - plot image not working Sree <sreejithpk@gmail.com> - 2013-07-04 02:25 -0700

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