Re: simplifying repeated macro calls in metafun

[Mikael Sundqvist <mickep@gmail.com>]

Hi,

yes, sure, I should have copied my code from the geometry document
where I do this kind of constructions over and over...

/Mikael

On Mon, Jun 21, 2021 at 4:31 PM Otared Kavian <otared@gmail.com> wrote:
>
> Hi Mikael,
>
> Thank you so much for the explanation: I am ashamed for not having read this in the MetaPost manual.
>
> Just to make sure whether I am beginning to understand, in your example code
>
> > z3 = whatever[z1,z2] = z0+whatever*dir(angle(z1-z0)+90));
>
> should the second « whatever » be
>
> z0 + whatever*dir(angle(z2 - z1) + 90)) ;
>
> or am I proving that I have not yet understood this wonderful command ?
>
> Thanks again and best regards: Otared
>
> > On 21 Jun 2021, at 14:21, Mikael Sundqvist <mickep@gmail.com> wrote:
> >
> > Hi,
> >
> > As is written in the MetaPost manual: Whatever generates a new
> > anonymous variable each time it is used. It is very useful in cases
> > where you are not interested in the value of a variable, but want to
> > use it to (let MP) calculate something. Example
> >
> > you have three points z0, z1, z2 forming a triangle, and you want to
> > find where the altitude from z0 is intersecting the line between z1
> > and z2. You can find that intersection z3 by writing
> >
> > z3 = whatever[z1,z2] = z0+whatever*dir(angle(z1-z0)+90));
> >
> > The first equality says only that z3 should be on the line between z1
> > and z2, the second one says that z3 should be on the line through z0,
> > perpendicular to the line between z1 and z2. Since MetaPost solves
> > linear equations, this defines z3, and we need not to think more about
> > the actual values of the "whatevers" (note that they are not in
> > general equal in this example!).
> >
> > Hope it helps!
> >
> > /Mikael
> >
> >
> > On Mon, Jun 21, 2021 at 2:07 PM Otared Kavian <otared@gmail.com> wrote:
> >>
> >> Hi Aditya,
> >>
> >> Thanks for the detailed file you sent to answer Dalyoung’s question and file. And going through both files I have a question.
> >> I see that both of you use a function « whatever » (but is it a function ?): what does this do and where can it be used (actually I have seen Hans using this expression, but I had always thought this is just a name…
> >>
> >> Best regards: Otared
> >>
> >>> On 21 Jun 2021, at 06:26, Aditya Mahajan <adityam@umich.edu> wrote:
> >>>
> >>> On Mon, 21 Jun 2021, Jeong Dal wrote:
> >>>
> >>>>
> >>>> Hi,
> >>>>
> >>>> I defined a macro definition in metafun, and draw figures using \startbuffer[] … \stopbuffer and \processMPbuffer[].
> >>>> As you see in the attached code, the same macro definition is used repeatedly by changing the numeric argument.
> >>>> Is there a better way to simplify the code, for example, using \dorecurse and recurselevel?
> >>>
> >>> See attached. The main idea is to store the repetitive bits in \startuseMPgraphic{...} and then reuse them using \includeMPgraphic.
> >>>
> >>> Aditya<mp-test.tex>___________________________________________________________________________________
> >>> If your question is of interest to others as well, please add an entry to the Wiki!
> >>>
> >>> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> >>> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> >>> archive  : https://bitbucket.org/phg/context-mirror/commits/
> >>> wiki     : http://contextgarden.net
> >>> ___________________________________________________________________________________
> >>
> >> ___________________________________________________________________________________
> >> If your question is of interest to others as well, please add an entry to the Wiki!
> >>
> >> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> >> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> >> archive  : https://bitbucket.org/phg/context-mirror/commits/
> >> wiki     : http://contextgarden.net
> >> ___________________________________________________________________________________
> > ___________________________________________________________________________________
> > If your question is of interest to others as well, please add an entry to the Wiki!
> >
> > maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> > webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> > archive  : https://bitbucket.org/phg/context-mirror/commits/
> > wiki     : http://contextgarden.net
> > ___________________________________________________________________________________
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________