From d7b0a683738537600fd43f326869696b8866e044 Mon Sep 17 00:00:00 2001
From: "W. Trevor King" <wking@tremily.us>
Date: Wed, 13 Feb 2013 16:32:12 -0500
Subject: [PATCH] energy.gp: Add gnuplot script and rules to build an energy

---
 Makefile  |  5 ++++-
 energy.gp | 11 +++++++++++
 2 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 energy.gp

diff --git a/Makefile b/Makefile
index 89dac64..0cc5151 100644
--- 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
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
-- 
2.26.2