Hi Gökhan,
I recommend you to use matplotlib.widgets.RectangleSelector instead of the
zoom functionality to select the data (An example can be found at
http://matplotlib.sourceforge.net/examples/widgets/rectangle_selector.html ).
This will return you the x and y-coordinate of button press and button release
event and with that you can take a portion of your data.
Something like the following could be a starting point:
x_min = min(eclick.xdata, erelease.xdata)
x_max = max(eclick.xdata, erelease.xdata)
x_new = x[(x>= x_min) & (x <= x_max)]
where eclick and erelease correspond to the click and release event of the
rectangle selection (see the example below).
Opening a new figure after show can be achieved by:
fig_new = plt.figure()
# some plotting
fig_new.show() # show up the new figure
best regards Matthias
yet another example for the usage of the RectangleSelector copied from its
class documentation:
"""
Select a min/max range of the x axes for a matplotlib Axes
Example usage::
from matplotlib.widgets import RectangleSelector
from pylab import *
def onselect(eclick, erelease):
'eclick and erelease are matplotlib events at press and release'
print ' startposition : (%f, %f)' % (eclick.xdata, eclick.ydata)
print ' endposition : (%f, %f)' % (erelease.xdata, erelease.ydata)
print ' used button : ', eclick.button
def toggle_selector(event):
print ' Key pressed.'
if event.key in ['Q', 'q'] and toggle_selector.RS.active:
print ' RectangleSelector deactivated.'
toggle_selector.RS.set_active(False)
if event.key in ['A', 'a'] and not toggle_selector.RS.active:
print ' RectangleSelector activated.'
toggle_selector.RS.set_active(True)
x = arange(100)/(99.0)
y = sin(x)
fig = figure
ax = subplot(111)
ax.plot(x,y)
toggle_selector.RS = RectangleSelector(ax, onselect, drawtype='line')
connect('key_press_event', toggle_selector)
show()
"""
On Friday 17 April 2009 02:26:51 Gökhan SEVER wrote:
> Hello,
>
> A quick question:
>
> I am using two numpy arrays to plot the figure shown in attachment. Is it
> possible to get array indices of selected X-axes while using the zoom
> function? Later I can create a new figure from this selected portion
> instead of the same figure and/or apply an analysis.
>
> Thank you.
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