visualpython-users

[Visualpython-users] Stripchart display with curve object?

[Mark <clu...@ya...>]

I am trying to create a realtime stripchart display by using the curve 
object. My problem is how to get the display "rolling". I would like to 
do this as efficient as possible (avoiding time consuming loops!).  Any 
ideas ?

thanks for any help,
Mark

		
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Re: [Visualpython-users] Stripchart display with curve object?

[Jonathan B. <jbr...@ea...>]

On Sun, 2006-04-16 at 21:14 +0100, Mark wrote:
> I am trying to create a realtime stripchart display by using the curve 
> object. My problem is how to get the display "rolling". I would like to 
> do this as efficient as possible (avoiding time consuming loops!).  Any 
> ideas ?

Your best bet is probably going to involve using slicing.  Maybe
something like this...

# expensive inner loop gets done in C
graphline[:-1] = graphline[1:]
# new data point tacked on to the end
graphline[-1] = n_point

HTH,
-Jonathan

Re: [Visualpython-users] Stripchart display with curve object?

[Mark <clu...@ya...>]

Jonathan Brandmeyer wrote:
> On Sun, 2006-04-16 at 21:14 +0100, Mark wrote:
>> I am trying to create a realtime stripchart display by using the curve 
>> object. My problem is how to get the display "rolling". I would like to 
>> do this as efficient as possible (avoiding time consuming loops!).  Any 
>> ideas ?
> 
> Your best bet is probably going to involve using slicing.  Maybe
> something like this...
> 
> # expensive inner loop gets done in C
> graphline[:-1] = graphline[1:]
> # new data point tacked on to the end
> graphline[-1] = n_point
> 
> HTH,
> -Jonathan

Thanks for the help. I could get the stripchart rolling by slicing "y", 
otherwise the position of the plotted points would not move:
band.y[:-1] = band.y[1:]

thank Mark

		
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Re: [Visualpython-users] Stripchart display with curve object?

[Flavio C. <fcc...@gm...>]

I wrote a Stripchart script a while ago,

take a look at it and feel free to use it, if you like it

Flavio

2006/4/17, Mark <clu...@ya...>:
>
> Jonathan Brandmeyer wrote:
> > On Sun, 2006-04-16 at 21:14 +0100, Mark wrote:
> >> I am trying to create a realtime stripchart display by using the curve
> >> object. My problem is how to get the display "rolling". I would like to
> >> do this as efficient as possible (avoiding time consuming loops!).  Any
> >> ideas ?
> >
> > Your best bet is probably going to involve using slicing.  Maybe
> > something like this...
> >
> > # expensive inner loop gets done in C
> > graphline[:-1] = graphline[1:]
> > # new data point tacked on to the end
> > graphline[-1] = n_point
> >
> > HTH,
> > -Jonathan
>
> Thanks for the help. I could get the stripchart rolling by slicing "y",
> otherwise the position of the plotted points would not move:
> band.y[:-1] = band.y[1:]
>
> thank Mark
>
>
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