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Re: How to find which variable caused the trigger in Manipulate[]
*To*: mathgroup at smc.vnet.net
*Subject*: [mg103824] Re: How to find which variable caused the trigger in Manipulate[]
*From*: "Nasser Abbasi" <nma at 12000.org>
*Date*: Thu, 8 Oct 2009 07:50:18 -0400 (EDT)
"Nasser Abbasi" <nma at 12000.org> wrote in message news:...
>
> Here is what I tried so far, and this fail:
>
> Manipulate[
> Which[
>
> x != oldx,
> {oldx = x; Text[StringJoin["you moved the ", "x ", " slider"]]},
>
> y != oldy,
> {oldy = y; Text[StringJoin["you moved the ", "y ", " slider"]]},
>
> True, Text["why Ami here??"]
> ],
>
> {x, 0, 1},
> {y, 0, 1},
> {oldx, -999, ControlType -> None},
> {oldy, -999, ControlType -> None}
> ]
>
As always seem to happen, after I posted the above, I find a solution. All
what I have to do is track the correct symbols.
Here is the solution
Manipulate[
Which[
x != oldx,
{oldx = x; Text[StringJoin["you moved the ", "x ", " slider"]]},
y != oldy,
{oldy = y; Text[StringJoin["you moved the ", "y ", " slider"]]},
True, Text["why Ami here??"]
],
{x, 0, 1},
{y, 0, 1},
{oldx, -999, ControlType -> None},
{oldy, -999, ControlType -> None},
TrackedSymbols -> {x, y} (*this is the trick*)
]
By telling Mathematica to only track x and y and not oldx and oldy, I get
what I want !
--Nasser
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