Hi, I am writing a program that reads three columns (one column containing the weights, the other two containing the values I want to plot) from a file containing the results from a MonteCarlo Markov Chain. The file contains thousends of lines. Then create the 2D histogram and make contourplots. Here is a sample of the code (I don't know if is correct, it's just to show what I do)
>>> import numpy as np >>> import matplotlib.pyplot as mplp >>> chain = np.loadtxt("chain.txt", usecols=[0,4,6]) #read columns 0 (the >>> weights), 4 and 6 (the data), from the file "chain.txt" >>> h2D, xe, ye = np.histogram2D(chain[:,1],chain[:,2], weights=chain[:,0]) >>> #create the 2D histogram >>> x = (xe[:-1] + xe[1:])/2. #x and y values for the plot (I use the mean >>> of each bin) >>> y = (ye[:-1] + ye[1:])/2. >>> mplp.figure() #open the figure >>> mplp.contourf(x, y, h2D.T, origin='lower') #contour plot As it is the contours are not smooth and they look not that nice. After days of searches I've found three methods and tried, unsuccesfully, to apply them 1) 2d interpolation: I got "segmentation fault" (on a quadcore machine with 8Gb of RAM) 2) Rbf (radial basis functions): I got wrong contours 3) ndimage: it creates spurious features (like secondary peaks parallel to the direction of the main one) Before beginning with Python, I used to use IDL to plot, and there is a function 'smooth' that smooth for you 2D histograms. I haven't found anything similar for Python. Does anyone have an idea or suggestion on how to do it? Thank in advance Francesco -- View this message in context: http://old.nabble.com/Smooth-contourplots-tp29253884p29253884.html Sent from the matplotlib - users mailing list archive at Nabble.com. ------------------------------------------------------------------------------ The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://ad.doubleclick.net/clk;226879339;13503038;l? http://clk.atdmt.com/CRS/go/247765532/direct/01/ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users