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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)
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  • 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



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