Re: [Haskell-cafe] Beginners Question: Problem with Data Type Declaration
Hi Johan, actually quite obvious. Code works now, many thanks. :-) import Data.Packed.Vector data PowerSig = PowerSig Int Double (Vector Double) -- signal Index timeStep data instance Show PowerSig where show (PowerSig idx dt vector) = "PowerSignal Nr: " ++ show idx ++ " dt: " ++ show dt ++ " val:" ++ show vector main = do let p = PowerSig 5 0.1 (fromList [0..10::Double]) putStrLn (show p) -- View this message in context: http://haskell.1045720.n5.nabble.com/Beginners-Question-Problem-with-Data-Type-Declaration-tp4494012p4494166.html Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Beginners Question: Problem with Data Type Declaration
Hi, On Thu, Jun 16, 2011 at 9:53 AM, kaffeepause73 wrote: > I try to create an own data type containing "Vector Double" from the H-Matrix > package. The code: > > ## > > data PowerSig = PowerSig Int Double Vector Double You need to put parenthesis around (Vector Double). Otherwise this is interpreted as a constructor with 4 fields (instead of 3). Johan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Beginners Question: Problem with Data Type Declaration
I try to create an own data type containing "Vector Double" from the H-Matrix package. The code: ## data PowerSig = PowerSig Int Double Vector Double main = do let p5 = PowerSig 1 0.1 (fromList [1,2,3]) ## When compiling with ghci, I get however the following message: `Vector' is not applied to enough type arguments Expected kind `?', but `Vector' has kind `* -> *' In the type `Vector' In the definition of data constructor `PowerSig' In the data type declaration for `PowerSig' I don't understand the compilers message and couldn't find any wiki-page/other material to help me. The Data Declaration somehow seems not to understand that "Vector Double" belongs together, but brackets don't help either. Cheers Phil -- View this message in context: http://haskell.1045720.n5.nabble.com/Beginners-Question-Problem-with-Data-Type-Declaration-tp4494012p4494012.html Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe