hyperbolic funtions in MP

hyperbolic funtions in MP

[Peter Rolf]

I have problems using the hyperbolic functions sinh and cosh (MetaFun manual
page 204) in metapost. A simple call of sinh (with valid parameter)

   ct:= sinh(3) ;

gives
----------------------------------------
This is pdfeTeX, Version 3.141592-1.10b-2.1 (MiKTeX 2.3)
ConTeXt  ver: 2003.4.29  fmt: 2003.5.8  int: english  mes: english
...
 >> xx-2
! Unknown relation will be considered false.
<to be read again>
                   :
**->if(EXPR1)=2:
                (EXPR0)*(EXPR0)else:takepower(EXPR1)of(EXPR0)fi
<to be read again>
                   )
exp->begingroup((mexp256)**(EXPR2))
                                   endgroup
<to be read again>
                   ;
sinh->begingroup.save.xx;xx=exp.xx;
                                   (xx-1/xx)/2endgroup
<to be read again>
                   ;
l.152 ct:= sinh(3) ;
                    
?
----------------------------------------                

Same error for cosh. The functions sin, cos and asinh, acosh work.
Please, could somebody test, if this is a general problem...

Greetings,

        Peter

Re: hyperbolic funtions in MP

[Hans Hagen]

At 15:09 17/05/2003 +0200, you wrote:
>I have problems using the hyperbolic functions sinh and cosh (MetaFun manual
>page 204) in metapost. A simple call of sinh (with valid parameter)
>
>   ct:= sinh(3) ;

in mp-tool.mp, change:

vardef sinh primary x = save xx ; xx = exp x ; (xx-1/xx)/2 enddef ;
vardef cosh primary x = save xx ; xx = exp x ; (xx+1/xx)/2 enddef ;

                                           ^^^

(you need to run "texexec --make metafun")

Hans
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Re: hyperbolic funtions in MP

[Jens-Uwe Morawski]

On Sat, 17 May 2003 15:09:09 +0200
Peter Rolf <peter.rolf@arcor.de> wrote:

> I have problems using the hyperbolic functions sinh and cosh (MetaFun manual
> page 204) in metapost. A simple call of sinh (with valid parameter)
> 
>    ct:= sinh(3) ;
> 

the following definition in mp-tool.mp
vardef sinh   primary x = save xx ; xx = exp xx ; (xx-1/xx)/2 enddef 

should be
vardef sinh   primary x = save xx ; xx = exp x ; (xx-1/xx)/2 enddef 


until Hans has fixed the problem you may use

\startMPinclusions
  vardef sinh   primary x = ((exp x) - ( exp (-x)))/2 enddef ;	
  vardef cosh   primary x = ((exp x) + ( exp (-x)))/2 enddef ;	
\stopMPinclusions

or if you prefer Hans' math definitions

\startMPinclusions
  vardef sinh   primary x = save xx ; xx = exp x ; (xx-1/xx)/2 enddef ;	
  vardef cosh   primary x = save xx ; xx = exp x ; (xx+1/xx)/2 enddef ;	
\stopMPinclusions

Jens