energy.gp: Add gnuplot script and rules to build an energy

diff --git a/Makefile b/Makefile
index 89dac64592a60f394a90c44da44f65d5580f07d2..0cc51519e44ca7109bcefb3fecb48d7bbccecf02 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -138,7 +138,7 @@ $(CXX_PROGRAMS): % : $$($$(*)_OBJECTS)
 #     gnuplot plot.gp
 # where plot.gp was a gnuplot script for plotting data generated by
 # RUN_PROGRAM.
-run: error.png phase.png
+run: error.png phase.png energy.png
 
 .SECONDEXPANSION:
 error-%.data: $(PROGRAMS)
@@ -163,6 +163,9 @@ phase.data:
 phase.png: phase.gp phase.data
        gnuplot "$<" > "$@"
 
+energy.png: energy.gp phase.data
+       gnuplot "$<" > "$@"
+
 # Pattern rule for compiling object files from C++ source
 # There is an implicit rule for this in GNU make
 #   http://www.gnu.org/software/make/manual/html_node/Catalogue-of-Rules.html

diff --git a/energy.gp b/energy.gp
new file mode 100644 (file)
index 0000000..8137aa6
--- /dev/null
+++ b/energy.gp
@@ -0,0 +1,11 @@
+set term png
+set termoption enhanced
+set title 'Particle energy'
+set xlabel 'x'
+set ylabel 'V(x) + K(x)'
+unset key
+k = 10
+b = 1
+V(r) = 0.5 * k * b**2 * exp(-r**2/b**2)
+set style data lines
+plot V(x) title 'V(r)', for [i=0:13] 'phase.data' index i using 2:6