s +∞, the result is NaN.
• If x is −∞, the result is NaN.
- Gordon
From: Gordon Smith
Sent: Monday, September 17, 2007 2:49 PM
To: 'flexcoders@yahoogroups.com'
Subject: RE: [flexcoders] Math.cos...?
That would be a bad idea because it would lead to dis
@yahoogroups.com
Subject: Re: [flexcoders] Math.cos...?
Math.cos() (and every other trig function) should check the argument
being PI (or any other of its own constants) before calculating, since
it would better reflect the mathematical function and maybe even save up
on some performance.
On 9/17
On Sep 17, 2007, at 4:49 PM, Mike Krotscheck wrote:
I may take you up on this challenge- I’ve got this strange
masochistic urge to see if ML has the same restriction. I seem to
recall proving e^i to an arbitrary significant digit, so Pi
shouldn’t be too much different.
You could do that.
: flexcoders@yahoogroups.com
Subject: RE: [flexcoders] Math.cos...?
It's not sloppy, it's just how floating point numbers work. Try the
same thing in other programming languages and you still will not get
zero (unless they round the output). For example, .NET reports the
resul
resource.com/>www.resource.com
>
> [EMAIL PROTECTED]
> --
>
> *From:* flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] *On
> Behalf Of *Samuel R. Neff
> *Sent:* Sunday, September 16, 2007 11:30 PM
> *To:* flexcoders@yahoogroups.com
> *Su
if the argument passed to
> Math.cos() is exact, the result generally won't be.
>
> - Gordon
>
> --
> *From:* flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] *On
> Behalf Of *Jon Bradley
> *Sent:* Sunday, September 16, 2007 2:49 PM
> *To
ed to Math.cos() is exact, the result generally won't be.
- Gordon
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Jon Bradley
Sent: Sunday, September 16, 2007 2:49 PM
To: flexcoders@yahoogroups.com
Subject: Re: [flexcoders] Math.cos...?
ck
Sent: Sunday, September 16, 2007 5:19 PM
To: flexcoders@yahoogroups.com
Subject: RE: [flexcoders] Math.cos...?
The documentation's actually fairly clear on this: "The cosine of a 90
degree angle is zero, but because of the inherent inaccuracy of decimal
calculations using binary numbers, F
D] <mailto:[EMAIL PROTECTED]>
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of Troy Gilbert
Sent: Sunday, September 16, 2007 5:15 PM
To: flexcoders@yahoogroups.com
Subject: Re: [flexcoders] Math.cos...?
> Why does Math.cos(Math.PI/2) not return zero?
Round-off er
That's pretty much it.
To a computer Math.cos(Math.PI/2) is not 0. It's really close to 0,
because PI is an infinite sequence and a computer can "only" store it
as a double precision floating point number (ie, a fixed value).
What you get back from this calculation is the error bound of the
> Why does Math.cos(Math.PI/2) not return zero?
Round-off error in the Math libs? It does return a value very close to
0 (1.7xe-17).
Troy.
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