Re: [Matplotlib-users] Possible bug in <slider>.reset() ?

[Benjamin R. <ben...@ou...>]

the reset() method is meant to return the slider back to its initialized
value, that's it.

I suspect what you are having difficulties with has to do with your use of
a global variable "amp". It is going to be completely unlikely that updates
to the slider's "val" attribute would actually be updating the global
variable rather than simply replacing it with a new variable. What are you
trying to do?

Ben Root


On Wed, Dec 17, 2014 at 2:01 PM, peterfR <pe...@pe...> wrote:
>
> [This post might appear twice, if so, I apologize. The first version is
> flagged that it has not been accepted yet]
>
> I am controlling a simple animation with a slider, successfully. A mouse
> drag updates the parameter correctly but the slider-bar position is not
> updated.
>
> If "samp" is a slider, the code
> "samp.reset(amp)" generates
> "TypeError: reset() takes exactly 1 argument (2 given)".
>
> Here is more detail of the code:
>
> =====
> samp = Slider(axamp, 'Amp', 0.1, 10.0, valinit=amp)
>
> def update(val):
>     global amp
>     amp = samp.val
> #   samp.reset()        # if this is included, a mouse-drag does not change
> value of amp. No error.
> #   samp.reset(amp)  # if this is included, a mouse-drag changes value of
> amp, but the
>                      # slider-bar-position is not updated. The animation
> continues to run in both cases.
>                      # AND GET ERROR:
> ***********
>  File "SAS_asl.py", line 28, in update
>     samp.reset(amp)     #
>
> TypeError: reset() takes exactly 1 argument (2 given)
> ***********
>
>
> # If there is no call to reset in “update” and the following function is
> included:
>
> def reset(event):
>     samp.reset()     # amp is changed, slider-bar-position is not updated
> and NO ERROR IS GENERATED
>
>
> samp.on_changed(update)  # always present!
>
> This appears to be a bug. If not, what is wrong with the code?
>
>
>
>
>
> --
> View this message in context:
> http://matplotlib.1069221.n5.nabble.com/Possible-bug-in-slider-reset-tp44638.html
> Sent from the matplotlib - users mailing list archive at Nabble.com.
>
>
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