Hi Alastair,
I don't have clue why yours doesn't work.
however I changed the following line in the update function
data[20]=data[20]+0.5
to
data = np.random.randn(100)
And it started updating the display, with new data each update.
maybe changing a single point is not seen as a big enough change?
Steve
Alastair McKinley wrote:
> Hi everyone,
>
> I am a new matplotlib user building a simple visualization tool.
>
> I was having some issues with the graph not redrawing and I think I
> have reduced it to a minimal case that doesn't work as expected for me.
>
> In the example below one of the data elements is changed on every
> iteration of the update function, but the graph does not update as
> expected.
>
> Am I making a mistake in my usage?
>
> Alastair
>
>
>
> #!/usr/bin/env python
>
> import gtk
> import gobject
> from matplotlib.figure import Figure
> import numpy as np
>
> from matplotlib.backends.backend_
> gtkagg import FigureCanvasGTKAgg as FigureCanvas
>
> def update(line):
> global data
> data[20]=data[20]+0.5
> line.set_ydata(data)
> line.axes.figure.canvas.draw()
> return True
>
> win = gtk.Window()
> win.connect("destroy", lambda x: x.destroy())
> win.set_default_size(400,300)
> fig = Figure(figsize=(5,4), dpi=100)
> ax = fig.add_subplot(111)
> canvas = FigureCanvas(fig)
> win.add(canvas)
>
> data = np.random.randn(100)
> line, = ax.plot(data)
>
> win.show_all()
>
> gobject.timeout_add(1000,update,line)
>
> gtk.main()
> ------------------------------------------------------------------------
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