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Re: Showing the Current Value of a Slider in Manipulate

• To: mathgroup at smc.vnet.net
• Subject: [mg103520] Re: [mg103487] Showing the Current Value of a Slider in Manipulate
• From: Murray Eisenberg <murray at math.umass.edu>
• Date: Sat, 26 Sep 2009 06:13:25 -0400 (EDT)
• Organization: Mathematics & Statistics, Univ. of Mass./Amherst
• References: <200909241151.HAA29183@smc.vnet.net>
• Reply-to: murray at math.umass.edu

I disagree: I would NOT want Labeled to be the default appearance for 
sliders in Manipulate.

One reason:  Look, for example, at:

   Manipulate[Plot[Sin[x(1 + a x)],{x,0,6}],{{a,0,"Multiplier"},0,4}]

You can readily change the style of that label "Multiplier", e.g., to 
make the font size larger or change its color, by wrapping it in a Style 
expression:

   Manipulate[Plot[Sin[x(1 + a x)],{x,0,6}],
      {{a, 0, Style["Multiplier", 24, Red]}, 0, 2}]

But if you include an Appearance->"Labeled" option...

   Manipulate[Plot[Sin[x(1 + a x)],{x,0,6}],
    {{a,0,Style["Multiplier", 24, Red]}, 0, 2, Appearance -> "Labeled"}]

... then so far as I am aware you cannnot change the style of the 
slider's numerical value as it appears to the right of the slider.

For presentations in class, I need to enlarge all the text, including 
text display of numerical values. That does not seem possible for the 
slider value just with the built-in Appearance option.  What I need to 
do is to change the body of the Manipulate to something like the following:

  Manipulate[
  Column[{Row[{Style["Multiplier = ", 24, Red], Style[a, 24, Red]}],
    Plot[Sin[x (1 + a x)], {x, 0, 6}]}], {{a, 0,
    Style["Multiplier", 24, Red]}, 0, 2}]

This way, I can make the label to the left of the slider and the current 
value shown have the same size, among other style possibilities.

But were Appearance->"Labeled" the default, then I'd have to make an 
additional change to default behavior so as to disable appearance of the 
current-value displayed to the right of the slider.


Harut Amirjanyan wrote:

> ...I think Appearance -> "Labeled" should be the default behavior for sliders
> in Manipulate.

-- 
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305

• References:
  • Showing the Current Value of a Slider in Manipulate
    • From: Harut Amirjanyan <amirjanyan@gmail.com>