Here’s an example script to calculate stuff in gnuplot. gnuplot is capable of many functions of the c programming language such as sin(x) erf(x). This is easy to extend since it is possible to define functions and perform logic.

Save this into a file `calc.gnu`

and run with with command `> gnuplot calc.gnu`

# gnuplot script by Mathew Peet # 18 February 2007 # Example script to calculate something # A = 1 B = 2 Answer = A + B print "The answer: ", Answer

This could be used in conjunction with regression of data to do all sort of useful stuff.

**List of supported functions**

In general, any mathematical expression accepted by C, FORTRAN, Pascal, or BASIC may be plotted. The precedence of operators is determined by the specifications of the C programming language.

The supported functions include:

abs(x), acos(x), asin(x), atan(x), cos(x), cosh(x), erf(x), exp(x), inverf(x), invnorm(x), log(x), log10(x), norm(x), rand(x), sgn(x), sin(x), sinh(x), sqrt(x), tan(x), tanh(x).

I saw your postings regarding Gnuplot, and thought you might be interested to know that there is now a book on it: “Gnuplot in Action”. You can pre-order it directly from the publisher: Manning: Gnuplot in Action.

If you want to learn more about the book and the author, check out my book page at Principal Value – Gnuplot in Action.

Let me know if you are interested in a review copy.