Hi Alun, On Wednesday 25 June 2008 07:09:52 am eShopping wrote: > Hi > > the following code snippet is from a simple wxpython/matplotlib app > > # Data object class > > class PlotData(object): > > # Constructor (dummy arrays) > > def __init__(self): > self.np = 100 > > self.xa = numpy.arange(100.0) > self.ya = 2.0 * self.xa > self.ys = 4.0 * self.xa > > > # Plot window class > > class PlotWin(object): > def __init__(self, data): > self.data = data # Store reference to data object > self.figure = Figure() # Initialise figure > > # Create an Axes object to plot on > > self.ax1 = self.figure.gca() > self.ax1.yaxis.tick_left() > self.ax1.xaxis.tick_bottom() > > # Plot the data > > self.lines=[] > > self.lines.append(self.ax1.plot(self.data.xa, self.data.ya, 'g')) > self.lines.append(self.ax1.plot(self.data.xa, self.data.ys, '-r')) > > > # Update plot with new data > > def RefreshPlot(self, data): > self.lines[0].set_data((self.data.xa,self.data.ya)) > self.lines[1].set_data((self.data.xa,self.data.ys)) > > self.canvas.draw() > > > # Main program > > if __name__ == "__main__": > data = PlotData() > pwin = PlotWin(data) > pwin.RefreshPlot(data) > > The plot data changes during the application and I just want to > replace the existing data with the new data (which may have a > different number of points compared to the old data). I get the > Python error "'list' object has no attribute 'set_data'" when the > code executes RefreshPlot(). AFAIK lines[0] and lines[1] are > 'Line2D' objects (at least that's what Python says they are when I > ask to have them printed) , which do have a 'set_data' method. I'm > sure there's something really easy that I need to do but just can't > see it - all suggestions gratefully received!
I think the problem is: self.lines.append(self.ax1.plot(self.data.xa, self.data.ya, 'g')) plot() returns a list of lines. You are appending that list to self.lines, so when you index self.lines[0] later, you are getting the list returned by plot. You should either use extend() instead of append, or you need to index deeper: self.lines[0][0] and self.lines[0][1]. Darren ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
