Xref: utzoo comp.os.os9:711 comp.sys.m6809:1168
Path: utzoo!attcan!uunet!mcrware!jejones
From: jejones@mcrware.UUCP (James Jones)
Newsgroups: comp.os.os9,comp.sys.m6809
Subject: Re: basic09 calculations
Summary: really RAD :-)
Keywords: scientific calculations and problems, trig functions
Message-ID: <1436@mcrware.UUCP>
Date: 3 Jan 90 07:45:43 GMT
References: <1692@esquire.UUCP>
Reply-To: jejones@mcrware.UUCP (James Jones)
Organization: Microware Systems Corp., Des Moines, Iowa
Lines: 15

In article <1692@esquire.UUCP> wynkoop@esquire.UUCP (Brett Wynkoop) writes:
>     Why does the following line of code yield the wrong answer under BASIC09?
>It works fine under microsoft basic on my model 102, and ECB on my coco.
>It even works fine on my hp67.  Help!
>
>distance =60*(acs((sin(lat1)*sin(lat2))+(cos(lat1)*cos(lat2)*cos(dlong))))

I post the answer here for the general public; Mr. Wynkoop has already received
replies via CIS.  BASIC09 comes up in the mode of presuming arguments to trig
functions (or results of the inverse trig functions) to be in *radians*; one
can switch that to degrees with the DEG command (and back with RAD, which
Valley Dudes should appreciate :-).  Mr. W. got the answer he expected with
DEG.

	James Jones