splot++

Author: cirosantilli

README.adoc

@@ -42,11 +42,14 @@ Minimal explained Gnuplot examples. Compiled outputs: http://www.cirosantilli.co
 .... link:multiple-blocks-inline.gnuplot[]
 .... link:multiple-blocks-headeres.gnuplot[]
 ... link:inline-data.gnuplot[Inline data]
-... link:samples.gnuplot[Samples]
+... Plot functions
+.... link:samples.gnuplot[Samples]
 .. link:object-circle.gnuplot[object circle]
 .. link:intervals.gnuplot[Intervals]
 .. 3D
-... link:splot.gnuplot[splot]
-... link:pm3d.gnuplot[]
+... link:splot.gnuplot[]
+... link:splot-data-linear.gnuplot[]
+... Heatmap
+.... link:heatmap.gnuplot[]
 .. link:animation.gif.gnuplot[GIF animation]
 .. link:interactive/[Interactive]

heatmap.gnuplot

@@ -0,0 +1,19 @@
+#!/usr/bin/env gnuplot
+
+## pm3d
+
+## Heat maps
+
+# Palette mapped 3D.
+
+# Represent the third dimension as color, and fill in the entire image.
+
+set size ratio -1
+set view map
+set samples 5
+set isosamples 20
+set urange [-5.0 : 5.0]
+set vrange [-10.0 : 10.0]
+set xrange [-10.0 : 10.0]
+set yrange [-15.0 : 15.0]
+splot '++' using 1:2:($1**2 + $2**2) notitle with pm3d

pm3d.gnuplot

@@ -1,17 +1,12 @@
 #!/usr/bin/env gnuplot
 
 ## samples
-
+#
 # Set the number of points for analytical function plots.
-
+#
 # Different  samples for different functions:
 # http://stackoverflow.com/questions/19524582/different-number-of-samples-for-different-functions
 
 set key off
 set samples 10
-plot x with points
-
-# TODO: how to set multiple sample rates?
-# replot here also replots the first one.
-#set samples 20
-#replot sin(x) + 1 with points
+plot [-3:3] sin(x) with linespoints

samples.gnuplot

@@ -0,0 +1,27 @@
+-3 1 9
+-3 2 9
+-3 3 9
+
+-2 1 4
+-2 2 4
+-2 3 4
+
+-1 1 1
+-1 2 1
+-1 3 1
+
+0 1 0
+0 2 0
+0 3 0
+
+1 1 1
+1 2 1
+1 3 1
+
+2 1 4
+2 2 4
+2 3 4
+
+3 1 9
+3 2 9
+3 3 9

splot-data-linear.dat

@@ -0,0 +1,4 @@
+#!/usr/bin/env gnuplot
+set hidden3d
+set xyplane at 0
+splot "splot-data-linear.dat" notitle with lines

splot-data-linear.gnuplot

@@ -2,6 +2,25 @@
 
 ## splot
 
-## 3D plot
+set terminal png
+set output 'splot-domain.png'
 
-splot x**2 + y**2
+# Number of x and y samples.
+set isosamples 10, 5
+
+# Plotted domain.
+# https://stackoverflow.com/questions/51529014/gnuplot-plot-range-different-from-axes-range/62728206#62728206
+set urange [-5.0 : 0.0]
+set vrange [-5.0 : 5.0]
+
+# Visible domain.
+set xrange [-5.0 : 5.0]
+set yrange [-5.0 : 5.0]
+
+# Just to make plot look nicer.
+set hidden3d
+set xyplane at 0
+set xlabel 'x'
+set ylabel 'y'
+
+splot '++' using 1:2:($2**2) with lines