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 <mic...@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 <ota...@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 <adit...@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>___________________________________________________________________________________
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>>
>> ___________________________________________________________________________________
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>>
>> maillist : ntg-context@ntg.nl /
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>> ___________________________________________________________________________________
> ___________________________________________________________________________________
> 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/
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