CODEWITHSUNDEEP
haskelltypes
Max K
Max K

Reputation: 171

usage of own data types Haskell receiving error: parse error (possibly incorrect indentation or mismatched brackets)

To run a simulation I created my own data Type, so I can store the parameters. 

        example:: Double -> SimuInfo -> Double
        example a information = 2* a * b
                              where
                                information{b = bFieldSaved }

        ...--Some other functions    

        data SimuInfo = Information {
                        massSaved:: Double
                        , chiSaved:: Double
                        , bFieldSaved :: Double
                        } deriving Show

        initialization:: Double -> Double -> Double -> SimuInfo
        initialization m chiInit b = Information{
                                  massSaved = m,
                                  chiSaved = chiInit,
                                  bFieldSaved = b
                                }

The problem is that, while trying to compile, I receive this error message. (the compiler says, that it is in the line where I have ...--Some other functions)

parse error (possibly incorrect indentation or mismatched brackets)

Thanks in advance

Upvotes: 0

Views: 67

Answers (2)

chepner
chepner

Reputation: 531605

You can pattern-match with record syntax, but you need to use the data constructor.

 example a (Information {bFieldSave = b}) = 2 * a * b

Also, your initialization function isn't really necessary, as it is really equivalent to the data constructor you already have underneath all the record syntax.

initialization:: Double -> Double -> Double -> SimuInfo
-- initialization m chiInit b = Information m chiInit b
initialization = Information

Upvotes: 0

Pedro Rodrigues
Pedro Rodrigues

Reputation: 1739

Your where clause doesn't look right - it should have a syntax like this:

where
  name = value

Perhaps you meant to write something like the following?

where
  b = bFieldSaved information

Upvotes: 4

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