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Today's Topics:
1. Re: Calling "zipWith" using "^" function. (Max Voit)
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Message: 1
Date: Mon, 9 Nov 2015 09:59:25 +0100
From: Max Voit <max.voit+m...@with-eyes.net>
To: beginners@haskell.org
Subject: Re: [Haskell-beginners] Calling "zipWith" using "^" function.
Message-ID: <20151109095925.17d65...@veeloqu.lan>
Content-Type: text/plain; charset=US-ASCII
On Sun, 8 Nov 2015 23:14:11 -0500
Venu Chakravorty <c.v...@aol.com> wrote:
> <interactive>:1:19:
> Ambiguous type variable `a' in the constraints:
> `Fractional a' arising from a use of `/' at
> <interactive>:1:19-44 `Integral a' arising from a use of `^' at
> <interactive>:1:20-24 Probable fix: add a type signature that fixes
> these type variable(s) ============================
> Could somebody please throw some light?
Consider the types of both (^) and (/). Then take a look at
https://www.haskell.org/onlinereport/haskell2010/haskell2x.png
and compare with your error message. Note especially that there is no
connection from Integral to Fractional or vice versa.
As a solution use either the already suggested (**) or fromIntegral
(mind the last subsection of
https://www.haskell.org/onlinereport/haskell2010/haskellch6.html )
best,
Max
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