** gnuplot basics**

Best, simplest, very powerful plotter (and more)

Can easily plot formulas or data_files or both!
few plotters can do it so simply!

gnuplot> **plot "File"** will plot column 1 as x , col 2 as y
of a file named "File"

or can specify which columns of multicolumn file:

gnuplot> **plot "File" u 3:1 w lines lt 1 lw 2**

will plot **u**sing column 3 as x and 1 as y
**w**ith lines, in red (lt 1), line_width 2

* Can plot formulas directly:*

gnuplot> ** R(x) = 1/(1+x**2)**
formula to plot (Runge function)

gnuplot> **plot R(x) ** default xrange is [-10:10]

*Can specify desired xrange [-5:5] , in blue (lt 3), lw 4:*

gnuplot> **plot [-5:5] R(x) lt 3 lw 4**

* Can plot several graphs on same plot:*

* formulas, and/or formulas and files:*
use comma in-between: plot "file" , R(x) , ... e.g.

gnuplot> ** G(x) = exp(-x**2)**
another formula to plot (Gaussian, bell curve)

gnuplot> **plot R(x) , G(x) ** (on default xrange, default colors)

*Better: specify xrange, colors, line_widths:*

gnuplot> **plot [-5:5] R(x) lt 1 lw 3, G(x) lt 2 lw 4 **

* Set xlabel, ylabel, title:*

gnuplot> **set xlabel 'x' ; set ylabel 'y'**

gnuplot> **set title 'Runge R(x) and Gaussian G(x)' **

gnuplot> **replot** (re-plot last plot)

See links on course page for more...