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Re: Math functions
From: |
Andreas Jaeger |
Subject: |
Re: Math functions |
Date: |
Sat, 06 Jul 2002 08:41:45 +0200 |
User-agent: |
Gnus/5.090007 (Oort Gnus v0.07) XEmacs/21.4 (Artificial Intelligence, i386-suse-linux) |
Jarmo <address@hidden> writes:
> Hello,
>
> I hope this is a right place to ask some questions about C - functions.
> I have created an application called MathPlanner and there is problems
> with math functions and I don't know what is wrong. These problems
> does appear in other applications as well.
>
> When I'am trying to calculate cos(90) the answer should be 0 but it is
> something like 1.234e-20. Many other functions will also give same
> kind of answers. So. How should I deal with this ?
> Is there any information available in this topic ?
glibc comes with a large manual that explains these and other topics.
Use "info libc" from the commandline to access it.
>From the manual:
Trigonometric Functions
=======================
These are the familiar `sin', `cos', and `tan' functions. The
arguments to all of these functions are in units of radians; recall
that pi radians equals 180 degrees.
Therefore cos(pi/2) is 0, but cos(90) not,
Andreas
--
Andreas Jaeger
SuSE Labs address@hidden
private address@hidden
http://www.suse.de/~aj
- Math functions, Jarmo, 2002/07/05
- Re: Math functions,
Andreas Jaeger <=