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Commit f31ba1a

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cirosantillicirosantilli
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Colormap
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lines changed

‎Makefile

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GIFS := $(patsubst %$(GIF_EXT)$(IN_EXT),%$(GIF_EXT),$(wildcard *$(IN_EXT)))
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PNGS := $(patsubst %$(IN_EXT),%$(PNG_EXT),$(wildcard *$(IN_EXT)))
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PNGS := $(filter-out main$(PNG_EXT),$(PNGS))
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# Remove some special files that should not be rendered.
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PNGS := $(filter-out main$(PNG_EXT) template$(PNG_EXT),$(PNGS))
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.PHONY: clean
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‎README.md

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1. [Label](label.gnuplot)
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1. [key](key.gnuplot)
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1. [key title](key-title.gnuplot)
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1. [columnheader](columnheader.gnuplot)
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1. Axis
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1. [Range](range.gnuplot)
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1. [offset graph](offset-graph.gnuplot)
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1. [Inline data](inline-data.gnuplot)
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1. [Samples](samples.gnuplot)
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1. [object circle](object-circle.gnuplot)
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1. [splot](splot.gnuplot)
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1. 3D
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1. [splot](splot.gnuplot)
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1. [pm3d](pm3d)
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1. [GIF animation](animation.gif.gnuplot)
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1. [Interactive](interactive/)

‎bibliography.md

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# Bibliography
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- <http://www.gnuplotting.org>

‎columnheader.gnuplot

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#!/usr/bin/env gnuplot
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# Take title from file. Skips the line.
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plot '-' linewidth 3 title columnheader(1)
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Square
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3 9
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‎data-multiple.gnuplot

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# Multiple plots from a single file.
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set multiplot layout 4,1
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# Column choice method.
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plot "square-line.data" using 1:2 title "Square", \
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"square-line.data" using 3:4 title "Line"
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# Double empty line separated data sets.
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plot '-' with lines
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1 1
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2 2
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3 3
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1 1
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2 4
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3 9
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e
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# Select a single data set from multiple data set file.
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plot 'multiple.data' index 0 with lines linecolor rgb 'red', \
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'multiple.data' index 1 with lines linecolor rgb 'green'
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# Choose by data name (from comments).
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plot 'multiple.data' index 'Square' with lines linecolor rgb 'red', \
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'multiple.data' index 'Line' with lines linecolor rgb 'green'
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# TODO: same as above but inline?
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# Maybe the problem is that each `-` expects a new file.
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# http://stackoverflow.com/questions/10397750/embedding-multiple-datasets-in-a-gnuplot-command-script
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#plot '-' index 0 with lines linecolor rgb 'red', \
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#'-' index 1 with lines linecolor rgb 'green'
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#1 1
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#2 2
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#3 3
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#1 1
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#2 4
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#3 9
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#e
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unset multiplot

‎data.gnuplot

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# - newline separated rows
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# - lines starting with # are ignored
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# - single empty lines are ignored
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# - double empty lines mean a new data set
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# - double empty lines mean a new data set. Use `using lines` to observe it.
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# C-like integers and floats are understood.
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‎inline-data.gnuplot

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## Inline data
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## -
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# Specify data without a separate file.
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# http://stackoverflow.com/questions/3318228/gnuplotting-data-without-a-textfile
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# Uses the special filename `-`.
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set multiplot layout 2,1
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set key outside
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plot '-' using 1:2
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plot '-' lw 3
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# Multiple data syntax looks like Bash EOF.
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plot '-' lw 3, '-' lw 3
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0 0
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1 1
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2 4
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3 9
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4 16
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0 0
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1 1
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2 2
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3 3
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4 4
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unset multiplot

‎interactive/README.md

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Put in a separate directory to avoid stalling the build.
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1. [animation](animation.gnuplot)
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1. [size](size.gnuplot)
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1. [colormap.gif](colormap.gif.gnuplot)

‎interactive/colormap.gif.gnuplot

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#!/usr/bin/env gnuplot
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# Artistic colormap rendering.
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# Placed here because it takes a long time, and is just artistic,
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# not a minimal example.
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set key off
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set view map
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set samples 100
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set isosamples 100
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set xrange [ -10 : 10 ]
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set yrange [ -10 : 10 ]
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n = 100
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do for [i=1:n] {
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splot '++' using 1:2:(sin(($1**2 + $2**2) * 2*pi*i/n)) with pm3d
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}

‎interactive/size.gnuplot

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#!/usr/bin/env gnuplot
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# Maximize: http://stackoverflow.com/questions/22493766/how-to-make-gnuplot-plot-in-a-maximized-window
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set terminal wxt size 1024,768
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plot x

‎introduction.md

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I recommend using the long form when scripting, and the short form for interactive sessions.
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## File extension
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<http://stackoverflow.com/questions/5497889/is-there-a-standard-file-extension-for-gnuplot-files>
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There are a bunch of options.
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I prefer `.gnuplot` as it is the clearest, but it has little support.
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The shebang helps Vim there.
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## Source code
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cvs -d:pserver:anonymous@gnuplot.cvs.sourceforge.net:/cvsroot/gnuplot login
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cvs -z3 -d:pserver:anonymous@gnuplot.cvs.sourceforge.net:/cvsroot/gnuplot co -P gnuplot
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cd gnuplot
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cvs update -r Release_5_0_1
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# Ubuntu 14.04.
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sudo apt-get build-dep gnuplot
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sudo apt-get install lua5.2
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./prepare
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./configure
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time make
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./src/gnuplot --version
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# Install is needed for it to work.
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sudo make install
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gnuplot --version
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When you get tired of it:
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sudo make uninstall
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Yes, CVS on SourceForge... but remember that this is a project started in 1985 :-)
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TODO: how to checkout a given version????

‎key-title.gnuplot

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set key outside center right
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plot \
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sin(x) title "my sin",\
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cos(x) title "my cos"
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sin(x) + 0 title "my sin",\
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sin(x) + 1 title "my sin + 1",\
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sin(x) + 2 notitle

‎key.gnuplot

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set multiplot layout 6,1
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# Can also be done with `plot notitle` for a single plot.
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set key off
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plot sin(x) title "off"
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‎main.gnuplot

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## piecewise
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step(x) = x>a ? 1 : 0
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step(x) = x > a ? 1 : 0
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p f(x)*(x<0.8) + g(x)*(x>=0.8)
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# disadvantage: both parts are always evaluated
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pr "as"."df"
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if( 1 ){ pr "1" }
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if( 0 ){ pr "0" }
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if (1) { pr "1" }
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if (0) { pr "0" }
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do for[i=1:5:2]{ pr i }
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do for[i=1:5:2]{ pr i }
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do for[i=1:5:2] { pr i }
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do for[i=1:5:2] { pr i }
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## Not possible in 4.6:
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‎multiple.data

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# Line
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# Squaree
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‎palette.gnuplot

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#!/usr/bin/env gnuplot
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## palette
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# Represent an extra dimension with color.
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# Variable point size is another option with `pointsize variable`:
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# http://gnuplot.sourceforge.net/demo/pointsize.html
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set key off
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set multiplot layout 3,1
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# We could also add a `using 1:2:3` here,
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# but that is the default.
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# TODO how to make this smooth?
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plot '-' with lines palette linewidth 3
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0 0 0
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# This example uses the special filename '+',
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# which makes x vary over the range,
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# so we can define everything with functions.
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plot '+' using 1:(sin($1)):($1**2) with lines palette linewidth 3
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# Switch between two colors only:
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# http://stackoverflow.com/questions/8717805/how-to-make-points-one-color-when-a-third-column-equals-zero-and-another-color
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set palette model RGB defined ( 0 'red', 1 'green' )
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plot '+' using 1:(sin($1)):($1 < 0 ? 0 : 1) palette linewidth 3
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unset multiplot

‎pm3d.gnuplot

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#!/usr/bin/env gnuplot
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## pm3d
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## Heat maps
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# Palette mapped 3D.
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# Represent the third dimension as color, and fill in the entire image.
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set view map
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set samples 10
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set isosamples 10
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set xrange [ -10 : 10 ]
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set yrange [ -10 : 10 ]
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splot '++' using 1:2:($1**2 + $2**2) with pm3d

‎with-line.gnuplot

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# Add a line to plotted data.
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plot \
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"square.data" with line,\
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"square.data" with lines,\
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"line.data" w l,

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