Re: MP graph auto axes

[Jens-Uwe Morawski <morawski@gmx.net>]

On Thu, 07 Nov 2002 09:55:29 +0100
Hans Hagen <pragma@wxs.nl> wrote:

 
> looks like some problem in interpreting the big numbers, (mp can handle 
> only numbers <4000 and some string trickery is used in the graph package); 
> does this also happens in stand alone graphics or is it context specific?
> 

no, the problem is not specific to ConTeXt. The problem is in the
Gipick_ macro. There a logarithm is calculated:
n = 1 for i=1 upto
	mlog(xpart Gmhh_-xpart Gmll_)/Mten - mlog m/(Mten-epsilon):
      *10 endfor;

The problem is that the argument of mlog becomes <0, thus it is not
defined. Here is the error message for the 3rd graph:

! Logarithm of -1385.99995 has been replaced by 0.
Gipick_->...i=1upto.mlog(xpart.Gmhh_-xpart.Gmll_)/
                                                  Mten-mlog.m/(Mten-epsilon)...

auto->...fi.else:hide(Gme_:=Gesame_)Gigen_(Gipick_
                                                  ,Gcma_.Gpack_(m,Gme_))fi
<to be read again>

I spend some time yesterday, but the package is a little tricky
and uses some not intuitive variable names. so...

Jens