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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
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