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- The modifications to gnuplot 3.2 in this directory add the
- capability of plotting probability distributions.
-
- This mod adds the following extra standard gnuplot functions:
-
- ibeta - incomplete beta function
- igamma - incomplete gamma function
- lgamma - natural log of gamma
- gamma - gamma function
- erf - error function (= trivial variation of infamous bell curve)
- erfc - 1.0 - error function (more accurate than 1.0 - erf yourself)
- rand - pseudo random number generator (in compliance with Knuth)
-
- using these things as building blocks, a gnuplot command file 'stat.inc'
- is provided with definitions of almost all statistical distributions.
-
- Author: Jos van der Woude, jvdwoude@hut.nl
-
- ==========================================================
- Directions to install gnuplot 3.3:
- (diffs are relative to gnuplot 3.0, patchlevel 2.0)
-
- If you have a BSD machine, add the following to
- the makefile.unx:
-
- OPTIONS = -DERF -DGAMMA
-
- and specfun.c to the SOURCES and specfun.o to the OBJECTS.
-
- For MSDOS machines (and non-BSD machines) do the following:
-
- ASSUMPTIONS:
- The diffs provided work for msdos based pc's, using turbo C, version 2.0,
- and Borland C++, version 2.0 or 3.0.
- If you use a different setup, you might have to make (some) changes.
-
- GOAL:
- To extend the standard function library of gnuplot 3.2 with the following
- functions:
-
- ibeta - incomplete beta function
- igamma - incomplete gamma function
- erf() - error function (= trivial variation of normal distribution function)
- erfc() - 1.0 - erf() (more accurate than computing 1.0 - erf() yourself)
- gamma() - gamma function (for entire domain!)
- lgamma() - natural logarithm of gamma function
- rand() - a statistical acceptable version of standard C rand() function
-
- These additions to the repertoire of standard functions turn gnuplot into
- an excellent tool for plotting statistical density and distribution functions.
-
- DETAILED INSTRUCTIONS:
- 0. Split the bottom part of this file into the appropriate files:
- readme.p3, patch3.dif, stat.inc, nomo95.dem, random.dem, prob.dem,
- prob2.dem, and specfun.c using an editor or a PD PC shar utility.
-
- 1. Use the patch program to generate new versions of:
- gnuplot.doc, command.c, internal.c, misc.c, parse.c, plot.c, plot.h,
- standard.c, util.c and version.c
-
- 2. Make sure that file specfun.c is in the gnuplot directory.
-
- 3. Use the make program to create new version of gnuplot.
-
- 4. Test the new functions with commmand files prob.dem, prob2.dem,
- random.dem and nomo95.dem.
-
- KNOWN BUG:
- On MSDOS machines this modification can result in a DGROUP segment overflow
- error at link time. The reason is that gnuplot uses the resources of the
- large memory model right up to the limit.
- There are two things you can do about this:
-
- 1. Compile gnuplot using the huge memory model.
- This was tested using Borland C++, version 2.0: Works fine, even with
- -DREADLINE enabled.
-
- 2. If you dont want to compile under the huge memory model you can try to
- disable unused terminal drivers in term.h. See instructions at top
- of file term.h.
-
-
- Happy plotting,
-
- Jos van der Woude
- Amsterdam, The Netherlands
- jvdwoude@hut.nl
-