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Using the forward pipe operator, known second argument and overloaded functions
f#pipeline

Hi I'm playing around with XNA and come across this problem, I suspect the solution is just not to use the pipeline process but I thought I'd check.

So here it is in C#

Math.Round(Math.Sin(angle * i), 4)

the 4 specifies the number of digits to round to

In F# using the forward pipe operator

let y = (angle * i) |> sin |> System.Math.Round

This does work but I don't seem to able to force the correct signature, i.e. to use the one with number of digits to use, is there some syntax I can use so that y would actually be a curried function that expects a 4 ?

Regards

.

System.Math.Round is a .Net call that takes a single argument that is the tuple (num,nDdigitsToRound) -- not a let-bound fn that can be curried. (The fact that the arg order is wrong here is another matter.)

You could do:

let y = (angle * i) |> sin |> (fun n -> System.Math.Round(n, 4))

but in this case

Math.Round(Math.Sin(angle * i), 4)

Seems much more canonically "mathy" anyway...

By on 6/22/2009 2:03 PM ()

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