On 19/01/14 12:06, willie ekaputra wrote:

Eg. how to make the translation formula ? u take a coordinate and multiply it with p Element R, so that it is translated , like 1, 3 to 2, 6 , I use a 2 as multiplicator , which is from real numbers.How to express this real number ?That is why " any number will just do ! " Regards , Wili.

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Hi again, A (limited precision) Real is sometimes known as a Double and that's what it is in Haskell. So what you're asking is how to take an arbitrary Double and translate your co-ordinate by it. Simply, you want a function. So if your co-ordinate is just a pair of two other Doubles (reals), you can do: type Coord = (Double, Double) -- Our co-ordinate -- Function that takes a Double and Coord and translates the Coord by -- the Double translateCoord s (x, y) = (s * x, s * y) You can then use it like: ‘translateCoord 2 (1, 3)’ to give you ‘(2, 6)’. PS: It's much easier for us to follow if you keep your conversation in a single thread. -- Mateusz K.