From: Eleanor McHugh Date: 2009-11-15T09:38:48+09:00 Subject: Re: Trajectories On 14 Nov 2009, at 23:40, Marnen Laibow-Koser wrote: > It should be fairly clear from the formulae. One thing that bears > repeating, though: never use the default floating-point numbers for > math; they're simply not precise enough. Use integers or BigDecimal. That rather depends on the required level of precision... Ellie Eleanor McHugh Games With Brains http://slides.games-with-brains.net ---- raise ArgumentError unless @reality.responds_to? :reason