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You can reach the person managing the list at beginners-ow...@haskell.org When replying, please edit your Subject line so it is more specific than "Re: Contents of Beginners digest..." Today's Topics: 1. Rounding to 2 decimal places (Raghav Malik) 2. Re: Rounding to 2 decimal places (David McBride) 3. Re: Rounding to 2 decimal places (Imants Cekusins) ---------------------------------------------------------------------- Message: 1 Date: Tue, 27 Mar 2018 16:11:51 +0000 From: Raghav Malik <malikrag...@gmail.com> To: Beginners@haskell.org Subject: [Haskell-beginners] Rounding to 2 decimal places Message-ID: <CANGM-H4wE=jtSuO=pxkmkzzmhyvj_x7dgb+h2o1sbh-iedq...@mail.gmail.com> Content-Type: text/plain; charset="utf-8" Hi, I have a complex double (x :+ y) where 'x' and 'y' are computed using sin and cos functions on an angle expressed in radians. However, the output on the command line (using GHCi) shows up with a lot of decimal places. How can I limit the values of 'x' and 'y' to having only two decimal places? Thanks, Raghav -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.haskell.org/pipermail/beginners/attachments/20180327/bf4b1bd1/attachment-0001.html> ------------------------------ Message: 2 Date: Tue, 27 Mar 2018 12:32:56 -0400 From: David McBride <toa...@gmail.com> To: The Haskell-Beginners Mailing List - Discussion of primarily beginner-level topics related to Haskell <beginners@haskell.org> Subject: Re: [Haskell-beginners] Rounding to 2 decimal places Message-ID: <can+tr40rxl85fseslmggbd1hafwx9ztekppwn_3_npr0y75...@mail.gmail.com> Content-Type: text/plain; charset="utf-8" Because there is already a Show instance for Complex a, you will have to use your own show function. Something list this. import Text.Printf import Data.Complex showComplex :: Complex Float -> String showComplex (a :+ b) = (printf "%.2f" a) ++ " :+ " ++ (printf "%.2f" b) On Tue, Mar 27, 2018 at 12:11 PM, Raghav Malik <malikrag...@gmail.com> wrote: > Hi, > > I have a complex double (x :+ y) where 'x' and 'y' are computed using sin > and cos functions on an angle expressed in radians. > > However, the output on the command line (using GHCi) shows up with a lot > of decimal places. How can I limit the values of 'x' and 'y' to having only > two decimal places? > > Thanks, > Raghav > > _______________________________________________ > Beginners mailing list > Beginners@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.haskell.org/pipermail/beginners/attachments/20180327/b3b2983b/attachment-0001.html> ------------------------------ Message: 3 Date: Tue, 27 Mar 2018 16:42:26 +0000 From: Imants Cekusins <ima...@gmail.com> To: The Haskell-Beginners Mailing List - Discussion of primarily beginner-level topics related to Haskell <beginners@haskell.org> Subject: Re: [Haskell-beginners] Rounding to 2 decimal places Message-ID: <cap1qiny2r2bbgn9ai1utnbbtv7exvb2xu3z8we7a+gswapw...@mail.gmail.com> Content-Type: text/plain; charset="utf-8" Or you could use Centi instead of Float: http://hackage.haskell.org/package/base-4.11.0.0/docs/Data-Fixed.html -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.haskell.org/pipermail/beginners/attachments/20180327/7e91787e/attachment-0001.html> ------------------------------ Subject: Digest Footer _______________________________________________ Beginners mailing list Beginners@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/beginners ------------------------------ End of Beginners Digest, Vol 117, Issue 15 ******************************************