Re: What is wrong with 2Pi?

*To*: mathgroup at smc.vnet.net*Subject*: [mg131175] Re: What is wrong with 2Pi?*From*: David Bailey <dave at removedbailey.co.uk>*Date*: Sat, 15 Jun 2013 04:25:08 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net*References*: <kpelbs$hr4$1@smc.vnet.net>

On 14/06/2013 09:47, Alexei Boulbitch wrote: > Dear community, > > This works: > > Manipulate[ > Plot[Sin[a x], {x, 0, 4 Pi}], {{a, 1}, 0, 6.28, > VerticalGauge[##, ImageSize -> 50] &}, ControlPlacement -> Left] > > This > > Manipulate[ > Plot[Sin[a x], {x, 0, 4 Pi}], {{a, 1}, 0, 2 \[Pi], > VerticalGauge[##, ImageSize -> 50] &}, ControlPlacement -> Left] > > however, does not work. I cannot move the gauge in this latter case, while it is easy to move it in the former one. > > So, if I am right, is it Pi placed instead of 6.28 that disturbs the functioning? Please check it. Looks like a bug. > > Alexei > > > Alexei BOULBITCH, Dr., habil. > IEE S.A. > ZAE Weiergewan, > 11, rue Edmond Reuter, > L-5326 Contern, LUXEMBOURG > > Office phone : +352-2454-2566 > Office fax: +352-2454-3566 > mobile phone: +49 151 52 40 66 44 > > e-mail: alexei.boulbitch at iee.lu > > > > If you initialise a to a real number, this problem goes away: Manipulate[ Plot[Sin[a x], {x, 0, 4 Pi}], {{a, 1.0}, 0, 2 \[Pi], VerticalGauge[##, ImageSize -> 50] &}, ControlPlacement -> Left] David Bailey http://www.dbaileyconsultancy.co.uk