Re: Maybe I'm just dumb...

Folks. I figured out the problem, but I can't figure out why it would give me an error. If I don't take the acos of $d, and just multiply (180/3.14159)*$d, then I can sort normally. Can anyone explain to me why the acos() function would be screwing up my sort?

Comment on Re: Maybe I'm just dumb...

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Re: Re: Maybe I'm just dumb... by Enlil (Parson) on May 16, 2003 at 05:25 UTC
Try this: `use Math::Cephes qw/acos/; for ( -2, -1.1, -1, 0, 1, 1.1, 2 ) { print acos($_),$/; }` [download] I expect you are getting something similar (i.e. #QNAN), as I am guessing some of the values `$d` are outside the domain of the "Real" solutions of acos. -enlil	[reply] [d/l] [select]
Re: Re: Maybe I'm just dumb... by belg4mit (Prior) on May 16, 2003 at 05:26 UTC
Can't acos return undef (for invalid input)? `-- I'm not belgian but I play one on TV.`	[reply]
Re: Re: Maybe I'm just dumb... by SparkeyG (Curate) on May 17, 2003 at 00:41 UTC
Just a thought, but is $dotproduct a PDL? If so, using acos should screw things up. But it's been a while since I used PDL.	[reply]