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## matplotlib-users

 [Matplotlib-users] autoscale y for current x range on display From: Adrian HILL - 2011-03-23 18:42:25 ```Hi, I am new to python and matplotlib and have a small question. Is there a way to autoscale the y axis for the current x range in view? Currently, my y axes are scaled to all the data. Thanks Adrian ```
 Re: [Matplotlib-users] autoscale y for current x range on display From: Paul Ivanov - 2011-03-23 19:58:17 Attachments: Message as HTML ```Adrian HILL, on 2011-03-23 19:42, wrote: > Hi, I am new to python and matplotlib and have a small question. > > Is there a way to autoscale the y axis for the current x range in view? > > Currently, my y axes are scaled to all the data. Hi Adrian, there isn't a built-in way of doing this at the moment, because the general case would require going through all of the plotted data and finding the min&max for only the parts of the data that are withing some range (as apposed to the min&max for all data). If there's some regularity about your data, or if you know that you'll have only a few (maybe even just one?) artist, you could implement such functionality using callbacks, such as 'xlim_changed' or 'ylim_changed'. The quickest way would be to have those callbacks adjust ax.dataLim and then call autoscale. plt.clf() ax = plt.gca() data = np.sin(np.linspace(0,10,100)) ax.plot(data) def cb(ax): start,stop = [int(x) for x in ax.get_xlim()] d = data[start:stop+1] ax.dataLim._points[:,1] = d.min(), d.max() # the previous line would need to change depending on your # data ax.autoscale_view(scalex=False,scaley=True) plt.draw() ax.callbacks.connect('xlim_changed',cb) plt.xlim(0,30) # for the next line to work in ipython you'll need to # paste/or cpaste this entire script, or just pause before # changing the xlim again to verify that it works as intended raw_input("press return for to rescale") plt.xlim(0,55) best, -- Paul Ivanov 314 address only used for lists, off-list direct email at: http://pirsquared.org | GPG/PGP key id: 0x0F3E28F7 ```