[metapost] Plotting a Gaussian Distribution in MetaPost
L. Nobre G.
nobre at cii.fc.ul.pt
Fri Nov 9 17:30:44 CET 2007
On 08/11/2007, Kevin Liu <metapost.5.mezzopiano at spamgourmet.com> wrote:
> I am currently learning MetaPost, which, thanks to the great tutorials, is going
> quite well. I am mostly using it to plot graphs of functions, which has also been
> going quite well so far. However, I am experiencing significant difficulties in
> plotting a normal distribution - The only output I have been able to achieve was
> quite confusing.
Perhaps you could send your code...
You'll need an histogram of a gaussian distribution, for starters.
for l=1 upto totalnum:
tmp := normaldeviate;
for k=1 upto classnum:
if ( tmp <= k*classtep-lowrange ) and ( tmp > (k-1)*classtep-lowrange ):
histogram[k] := incr( histogram[k] );
> The graph package handles the task quite well, but it has limitations of its own. I
> would prefer an implementation directly in MetaPost to allow for maximum
What customization do you need?
> Do you know of any solutions to this problem?
What exactly is the problem?
> Could this be a symptom of the very small numbers involved?
> Should I compute the numerical data and try to import it into MetaPost?
> Do you know of any bézier approximations of the gaussian distribution?
I know some pocket calculators use a sort of bézier approximations of
the gaussian distribution. About five control points are enough.
L. Nobre G. - http://burocracia.blogspot.com/
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