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# Plotting histograms, scatter plots in Python

 What is the easiest way to generate some plots and graphs in Python ? Specifically interested in simple histograms and scatter plots with circles and regression lines. Thanks for your suggestions. Jul 18 '05 #1
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 Dr. Colombes wrote: What is the easiest way to generate some plots and graphs in Python ? Specifically interested in simple histograms and scatter plots with circles and regression lines. google('matplotlib') google('gnuplot.py') hth, f Jul 18 '05 #2
 One module is Matplotlib, that seems to model the Matlab way of doing things .... its at sourceforge. Peter W. At 02:18 PM 8/6/2004, Dr. Colombes wrote:What is the easiest way to generate some plots and graphs in Python ?Specifically interested in simple histograms and scatter plots withcircles and regression lines.Thanks for your suggestions.--http://mail.python.org/mailman/listinfo/python-list Jul 18 '05 #3
 >>>>> "Colombes" == Colombes writes: Colombes> What is the easiest way to generate some plots and Colombes> graphs in Python ? Specifically interested in simple Colombes> histograms and scatter plots with circles and regression Colombes> lines. Here's a little example of a histogram and regression plot using matplotlib - looks easy enough to me! Output image at http://nitace.bsd.uchicago.edu:8080/...share/demo.png from matplotlib.matlab import * x = randn(10000) # some gaussian noise subplot(211) # a subplot hist(x, 100) # make a histogram grid(True) # make an axes grid ylabel('histogram') # now do the regression... x = arange(0.0, 2.0, 0.05) y = 2+ 3*x + 0.2*randn(len(x)) # y is a linear function of x + nse # the bestfit line from polyfit m,b = polyfit(x,y,1) # a line is 1st order polynomial... # plot the data with blue circles and the best fit with a thick # solid black line subplot(212) plot(x, y, 'bo', x, m*x+b, '-k', linewidth=2) ylabel('regression') grid(True) # save the image to hardcopy savefig('demo') show() Jul 18 '05 #4
 > What is the easiest way to generate some plots and graphs in Python ? Pychart: http://www.hpl.hp.com/personal/Yasushi_Saito/pychart/ Jul 18 '05 #5
 Paramjit Oberoi wrote:What is the easiest way to generate some plots and graphs in Python ? Pychart: http://www.hpl.hp.com/personal/Yasushi_Saito/pychart/ The charts look good, but the source code links fail. Colin W. Jul 18 '05 #6
 >> Pychart: http://www.hpl.hp.com/personal/Yasushi_Saito/pychart/ The charts look good, but the source code links fail. I just tried downloading it, and they seem to work for me... Jul 18 '05 #7
 Colin J. Williams wrote: Paramjit Oberoi wrote:What is the easiest way to generate some plots and graphs in Python ? Pychart: http://www.hpl.hp.com/personal/Yasushi_Saito/pychart/ The charts look good, but the source code links fail. I found it funny that the author makes a comment about poor PostScript quality in Gnuplot, touting his as an alternative. If the examples on that page are to be believed, that stuff looks like low-quality Excel-type business charts, while Gnuplot has been producing publication quality EPS for a loooong time (ask the many thousands of scientists using it since the early 90's). I'd say that matplotlib is the _real_ contender to gnuplot today, not that toy with horrible font scaling, no apparent real symbol/math support, ugly legend boxes... Best, f Jul 18 '05 #8
 Dr********@yahoo.com (Dr. Colombes) wrote in message news:... What is the easiest way to generate some plots and graphs in Python ? Specifically interested in simple histograms and scatter plots with circles and regression lines. Thanks for your suggestions. For high quality scientific plot I suggest ppgplot and plplot. pgplot (original) http://www.astro.caltech.edu/~tjp/pgplot/ ppgplot (python module) http://efault.net/npat/hacks/ppgplot/ plplot http://plplot.sourceforge.net/ Jul 18 '05 #9
 John, Peter et al: Thanks very much for your useful tips on MathPlotLib. I've begun using MatPlotLib and I like it. Others suggested GnuPlot, which I hope to try sometime in the future. Thanks all. This is a good example of very useful information exchanged over an Internet newsgroup. Dr. Colombes John Hunter wrote in message news:...>> "Colombes" == Colombes writes: Colombes> What is the easiest way to generate some plots and Colombes> graphs in Python ? Specifically interested in simple Colombes> histograms and scatter plots with circles and regression Colombes> lines. Here's a little example of a histogram and regression plot using matplotlib - looks easy enough to me! Output image at http://nitace.bsd.uchicago.edu:8080/...share/demo.png from matplotlib.matlab import * x = randn(10000) # some gaussian noise subplot(211) # a subplot hist(x, 100) # make a histogram grid(True) # make an axes grid ylabel('histogram') # now do the regression... x = arange(0.0, 2.0, 0.05) y = 2+ 3*x + 0.2*randn(len(x)) # y is a linear function of x + nse # the bestfit line from polyfit m,b = polyfit(x,y,1) # a line is 1st order polynomial... # plot the data with blue circles and the best fit with a thick # solid black line subplot(212) plot(x, y, 'bo', x, m*x+b, '-k', linewidth=2) ylabel('regression') grid(True) # save the image to hardcopy savefig('demo') show() Jul 18 '05 #10

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