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Re: Keep Slider Consistent With a Slow Graph

  • To: mathgroup at smc.vnet.net
  • Subject: [mg100170] Re: Keep Slider Consistent With a Slow Graph
  • From: dh <dh at metrohm.com>
  • Date: Wed, 27 May 2009 04:06:05 -0400 (EDT)
  • References: <gvdqtl$6q1$1@smc.vnet.net>


Hi,

a possible solution is to disable the slider during graphic computations:

==========================

ffl = True;

Manipulate[(ffl = False; t = plotSlowGraph[xMax]; ffl = True;

   t), {{xMax, 10, "x Max"}, 10, 400, 10, Appearance -> "Labeled",

   Enabled -> Dynamic@ffl}, ContinuousAction -> False,

  SaveDefinitions -> True]

============================

Daniel



bobbaillie at frii.com wrote:

> The graph displayed by the Manipulate below takes a while to display.

> While the calculation is taking place, if you click on some other

> value on the slider, the slider moves and displays its new value.

> However, the graph will plot using the original value.

> 

> The result is that the graph and the slider are now out of sync.  This

> is bad user interface design.

> 

> In the real example I am working with, there is no way to make the

> calculations go fast enough to keep up with clicks on the slider.  For

> the same reason, I cannot allow the user to slide the slider, so

> ContinuousAction must be False.

> 

> Nevertheless, is there some way to make sure the slider and the graph

> stay consistent with each other?

> 

> Robert Baillie

> 

> plotSlowGraph[xMax_] :=

> Module[

>   { x, t },

>   Plot[ NIntegrate[1/((t^2 - 1)*t*Log[t]),

>        {t, x, Infinity}], {x, 2, xMax} ]

> ];

> 

> Manipulate[

>   Graphics[ plotSlowGraph[xMax] ],

>   { {xMax, 10, "x Max"}, 10, 400, 10, Appearance -> "Labeled" },

>   ContinuousAction -> False, SaveDefinitions->True

> ]

> 




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