[Matplotlib-users] two distributions on a histogram
Hello, Is it possible to plot two histograms on the same axis without having the bars on top of each other. I'm trying to determine how similar a distribution of activity is between a large data set and a small subset. I have 2 million records with a last activity date. I can plot both the sample and the full population on a normalized histogram, and in different colours but the later plot covers smaller values of the earlier one. Thanks Neil - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] two distributions on a histogram
See below for Antonio Gonzalez solution (last year) that I have started using and happy with it Neil M wrote: > Hello, > > Is it possible to plot two histograms on the same axis without having > the bars on top of each other. > > I'm trying to determine how similar a distribution of activity is > between a large data set and a small subset. > > I have 2 million records with a last activity date. I can plot both > the sample and the full population on a normalized histogram, and in > different colours but the later plot covers smaller values of the > earlier one. > > Thanks > Neil > Original Message Subject:Re: [Matplotlib-users] plotting overlapped histograms Date: Mon, 13 Nov 2006 19:02:03 +0100 From: Antonio Gonzalez <[EMAIL PROTECTED]> To: David E. Konerding <[EMAIL PROTECTED]> CC: Matplotlib-users@lists.sourceforge.net References: <[EMAIL PROTECTED]> To compare two histograms you can plot a bihistogram as suggested on http://www.itl.nist.gov/div898/handbook/eda/section3/bihistog.htm The little function I've written to do so is below. See if it helps. Antonio import scipy from pylab import figure def bihist(y1, y2, nbins=10, h=None): ''' Bihistogram. h is an axis handle. If not present, a new figure is created. ''' if h is None: h = figure().add_subplot(111) xmin = scipy.floor(scipy.minimum(y1.min(), y2.min())) xmax = scipy.ceil(scipy.maximum(y1.max(), y2.max())) bins = scipy.linspace(xmin, xmax, nbins) n1, bins1, patch1 = h.hist(y1, bins) n2, bins2, patch2 = h.hist(y2, bins) # set ymax: ymax = 0 for i in patch1: height = i.get_height() if height > ymax: ymax = height # invert second histogram and set ymin: ymin = 0 for i in patch2: height = i.get_height() height = -height i.set_height(height) if height < ymin: ymin = height h.set_ylim(ymin*1.1, ymax*1.1) h.figure.canvas.draw() ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] two distributions on a histogram
Neil M wrote: > Hello, > > Is it possible to plot two histograms on the same axis without having > the bars on top of each other. > > I'm trying to determine how similar a distribution of activity is > between a large data set and a small subset. > > I have 2 million records with a last activity date. I can plot both > the sample and the full population on a normalized histogram, and in > different colours but the later plot covers smaller values of the > earlier one. > > Thanks > Neil Neil, I can think of two alternatives. If one of the two distributions has all values higher than the other, so you want it to be behind, then you can use the zorder property of the patches. From your description it sounds like this is the case. If not, however, you can set the alpha property so that both sets of bars are semi-transparent. Both of these properties can be passed in as kwargs to the hist() function: hist(randn(200), edgecolor='r', zorder=5, alpha=0.5) hist(randn(500), edgecolor='g', zorder=4, alpha=0.5) Eric > > - > This SF.net email is sponsored by: Splunk Inc. > Still grepping through log files to find problems? Stop. > Now Search log events and configuration files using AJAX and a browser. > Download your FREE copy of Splunk now >> http://get.splunk.com/ > ___ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] two distributions on a histogram
Thanks That was just what I was looking for. The bihistogram solution is interesting too, but I think I will to with alpha since I might want to use a log y scale. Regards Neil On Nov 12, 2007 3:06 PM, Eric Firing <[EMAIL PROTECTED]> wrote: > > Neil M wrote: > > Hello, > > > > Is it possible to plot two histograms on the same axis without having > > the bars on top of each other. > > > > I'm trying to determine how similar a distribution of activity is > > between a large data set and a small subset. > > > > I have 2 million records with a last activity date. I can plot both > > the sample and the full population on a normalized histogram, and in > > different colours but the later plot covers smaller values of the > > earlier one. > > > > Thanks > > Neil > > Neil, > > I can think of two alternatives. If one of the two distributions has > all values higher than the other, so you want it to be behind, then you > can use the zorder property of the patches. From your description it > sounds like this is the case. If not, however, you can set the alpha > property so that both sets of bars are semi-transparent. > > Both of these properties can be passed in as kwargs to the hist() function: > > hist(randn(200), edgecolor='r', zorder=5, alpha=0.5) > hist(randn(500), edgecolor='g', zorder=4, alpha=0.5) > > Eric > > > > > - > > This SF.net email is sponsored by: Splunk Inc. > > Still grepping through log files to find problems? Stop. > > Now Search log events and configuration files using AJAX and a browser. > > Download your FREE copy of Splunk now >> http://get.splunk.com/ > > > ___ > > Matplotlib-users mailing list > > Matplotlib-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > > - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] A question about pam/zoom functionality of navigationtoolbar
John, On Nov 10, 2007 2:41 AM, John Hunter <[EMAIL PROTECTED]> wrote: > > Now that is a well focused question. Thank you for your teaching. ^_^. > > A little googling revealed that > > when a gtk drawing area (eg an matplotlib canvas) is placed in a gtk > > notebook, it needs to have the focus to receive key press events. Thank you for the information. It's really the point. > I had hoped it would be enough to do > canvas.grab_focus() > but apparently it is not (upon testing). But the suggestion from the > link above to use TAB to grab the focus worked in my tests. > With a little more testing, I find if I grab the focus after showing > the window that the notebook is in, it works as expected: Thank you for your patient test. Just for information, it is also workable to set current page for notebook firstly and then grab focus for the drawing area, such as notebook.set_current_page(pageno) canvas.grab_focus() #canvas is the view embedded in page $pageno Thanks again for your help. -- sunzen <> - This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
