Storing point from data file in variable
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Storing point from data file in variable
by Jeremy Conlin
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I have a file containing all my data. I can easily plot that data. I need
to store the first data point in a particular column so I can place a label at that point. Can someone show me how to do this? Small example: # ---------------------------------- x1 = # Get data from file y1 = 1.0 set label "Hello" at x1, y1 right # ----------------------------------- Thanks, Jeremy ------------------------------------------------------------------------------ OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get _______________________________________________ Gnuplot-info mailing list Gnuplot-info@... https://lists.sourceforge.net/lists/listinfo/gnuplot-info |
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Re: Storing point from data file in variable
by Thomas Sefzick
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get 1st data of column 3:
x1 = system("head -n1 datafilename | cut -d ' ' -f 3") or x1 = system("head -n1 ts.dat | awk '{print $3}'") or with gnuplot 4.3-cvs: set table plot 'datafilename' us 0:($0==0?(x1=$3):$3) unset table
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Re: Storing point from data file in variable
by Jeremy Conlin
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On Thu, Jun 4, 2009 at 5:06 AM, Thomas Sefzick <t.sefzick@...>wrote:
> > get 1st data of column 3: > > x1 = system("head -n1 datafilename | cut -d ' ' -f 3") > or > x1 = system("head -n1 ts.dat | awk '{print $3}'") > > or with gnuplot 4.3-cvs: > > set table > plot 'datafilename' us 0:($0==0?(x1=$3):$3) > unset table > it's rather cryptic. Can you tell me what everything means or point me toward the documentation explaining it? Thanks, Jeremy ------------------------------------------------------------------------------ OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get _______________________________________________ Gnuplot-info mailing list Gnuplot-info@... https://lists.sourceforge.net/lists/listinfo/gnuplot-info |
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Re: Storing point from data file in variable
by Thomas Sefzick
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starting with gnuplot 4.3-cvs there are new operators
'=' and ',' in expression syntax, that means, one can use them for the 'using' modifier inside a 'plot' command. defining labels must be done before plotting, but access to the data you don't have before plotting, so filling a variable with some value from the datafile can only be done when plotting (but then it's too late to define a label). one solution is to do a dummy plot by plot 'nothing to nowhere', by doing this you can set the variable. (plotting to nowhere can be done by specifying 'set out "/dev/null"' on unix systems, or, plotting nothing can be done by printing a table to the terminal window or text window) then you define the title, label, .... and afterwards you do the real plot. gnuplot> set table gnuplot> plot 'datafilename' us 0:($0==0?(x1=$3):$3) gnuplot> unset table for explanation of the syntax see gnuplot> help table gnuplot> help ternary gnuplot> help using gnuplot> help using pseudocolumns
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Re: Storing point from data file in variable
by Jeremy Conlin
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On Thu, Jun 4, 2009 at 11:57 AM, Thomas Sefzick <t.sefzick@...>wrote:
> > starting with gnuplot 4.3-cvs there are new operators > '=' and ',' in expression syntax, that means, one can use > them for the 'using' modifier inside a 'plot' command. > > defining labels must be done before plotting, but access > to the data you don't have before plotting, so filling a variable > with some value from the datafile can only be done > when plotting (but then it's too late to define a label). > > one solution is to do a dummy plot by plot 'nothing to > nowhere', by doing this you can set the variable. > (plotting to nowhere can be done by specifying > 'set out "/dev/null"' on unix systems, or, plotting > nothing can be done by printing a table to > the terminal window or text window) > then you define the title, label, .... > and afterwards you do the real plot. > > gnuplot> set table > gnuplot> plot 'datafilename' us 0:($0==0?(x1=$3):$3) > gnuplot> unset table > > for explanation of the syntax see > gnuplot> help table > gnuplot> help ternary > gnuplot> help using > gnuplot> help using pseudocolumns Thank you for that great information. I'll look up those help topics and if I have any questions, I'll post them here. Jeremy ------------------------------------------------------------------------------ OpenSolaris 2009.06 is a cutting edge operating system for enterprises looking to deploy the next generation of Solaris that includes the latest innovations from Sun and the OpenSource community. Download a copy and enjoy capabilities such as Networking, Storage and Virtualization. Go to: http://p.sf.net/sfu/opensolaris-get _______________________________________________ Gnuplot-info mailing list Gnuplot-info@... https://lists.sourceforge.net/lists/listinfo/gnuplot-info |
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