gnuplot reference
mar-07

plot data:
	plot "file.dat" ti "Energy spectrum" index 0:0 using 1:2
	#index indicates blocks of data to plot
	#(first block is index 0)
	# blocks are separated by 2 blank lines
	#using a:b = plot columns a and b

	splot "file.dat" using 1:2:3
	#3-d plot

	plot "file.dat" index 0:1 using 1:2:3 with yerrorbars
	#use column 3 as y-errors

	plot "file.dat" index 0:1 using 1:2:3:4 with yerrorbars
	#y has a range of col3 and col4

	plot "file.dat" index 0:1 using 1:2:3:4 with xyerrorbars
	#plot both x-errors and y-errors

	plot "file.dat" index 0:1 using 1:2:3:4 with xyerrorbars, \
	"file2.dat" using 2:3, "file3.dat" using 4:3 ti 'data2',\
	"file4.dat" using 2:5 ti 'data4', sin(x) ti 'sine(x)' 
	# use backslash to continue long line

styling:
	set logscale x
	#use log scale on x axis

	set xlabel "E (MeV)"
	
	plot "file.dat" with [points, boxes, steps, lines, linespoints]
	#different plot styles
	
	#histogram styles:
	#	steps: data points are used as initial position
	#	fsteps: data points are used as final position
	#	histeps: data points are used as central position
	show pointsize
	set pointsize 2
	set grid
	unset grid

fit data to function:
	f(x) = a*exp(-b*x/c**2)
	a = 2.0 
	fit f(x) "file.dat" using 1:2 via b,c
	plot f(x),"file.dat" using 1:2

save file:
	set term [png, postscript, x11, aqua, ..etc]
	set output "plot.[png,eps]"
	replot
	save "plot.plt"
	set term x11 
	set output

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roppon picha