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From: Max Chernoff via ntg-context <ntg-context@ntg.nl>
To: ntg-context@ntg.nl
Cc: Max Chernoff <mseven@telus.net>
Subject: Re: atan2 function
Date: Thu, 13 Oct 2022 00:42:27 -0600	[thread overview]
Message-ID: <df02f4dffb10b516a373b3028e78f299c2e6d042.camel@telus.net> (raw)
In-Reply-To: <CAANrE7qnUfQOtmxfVBpTPsW-ff=dPr9RD8V_Yyw30gQpFmdVvQ@mail.gmail.com>

Hi,

> How is atan2 called? I rolled my own as follows:

> Is atan with two parameters supposed to behave like atan2?

At mp-math.mpxl:167 there is:

       vardef atan   primary x = angle(1,x)       enddef ;
   
The MetaPost manual says:

   The angle operator takes a pair and computes the two-argument
   arctangent; i.e., angle is the inverse of the dir operator
   
So it looks like "angle" is the function that you want for "atan2". 

Thanks,
-- Max
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  reply	other threads:[~2022-10-13  6:42 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-13  5:40 Thangalin via ntg-context
2022-10-13  6:42 ` Max Chernoff via ntg-context [this message]
2022-10-13 19:51   ` Thangalin via ntg-context
2022-10-14  0:35     ` Max Chernoff via ntg-context
2022-10-14  8:07       ` Hans Hagen via ntg-context
2022-10-14 14:40         ` Alan Braslau via ntg-context
2022-10-14 18:59           ` Thangalin via ntg-context
2022-10-14 22:42             ` Alan Braslau via ntg-context
2022-10-14 23:09               ` Thangalin via ntg-context
2022-10-15  1:22                 ` Alan Braslau via ntg-context
2022-10-14 12:26     ` Alan Braslau via ntg-context
2022-10-14 12:58       ` Taco Hoekwater via ntg-context
2022-10-14 13:05         ` luigi scarso via ntg-context

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