Just give a look at zip(*head) and see that now it return two values so you can't assign it to three variables.
¿What's the meaning of that data arrange? I can't make any sense of plotting a 2D scatter from a 3D array. Goyo El jue, 25-09-2008 a las 15:15 +0200, Oz Nahum escribió: > Hi, > Thanks for your reply and appologies for my late response. > This indeed does the job. But after playing a little bit with the > code, I have discovered a few things: > first, I'd rather work with lists not tuples so I could actually > change my huge array of points. > second the array I described is kind of a pseudo 2D: > It has one big row. > head = [[0, 0, 10], > [1, 0, 13], > [2, 0, 11], > [3, 0, 12], > [1, 2, 11]] > > When I try to use a 3D array, with rows and columns > > import pylab as pl > > head = [[[0, 0, 10], [0, 1, 13]], > [[1, 0, 11], [1, 1, 12]], > [[2, 1, 11], [2, 2, 14]]] > > x, y, z = zip(*head) > xi, yi = pl.arange(0, 4, 0.1), pl.arange(0, 3, 0.1) > g = pl.griddata(x, y, z, xi, yi) > pl.scatter(x, y) > pl.contour(xi, yi, g) > pl.show() > > I get this error: > Traceback (most recent call last): > File "asfplot.py", line 9, in <module> > x, y, z = zip(*head) > ValueError: need more than 2 values to unpack > > > On Sat, Sep 20, 2008 at 2:19 PM, Goyo <[EMAIL PROTECTED]> wrote: > Try something like this: > > import pylab as pl > > head = ((0, 0, 10), > (1, 0, 13), > (2, 0, 11), > (3, 0, 12), > (1, 2, 11)) > > > x, y, z = zip(*head) > xi, yi = pl.arange(0, 4, 0.1), pl.arange(0, 3, 0.1) > g = pl.griddata(x, y, z, xi, yi) > pl.scatter(x, y) > pl.contour(xi, yi, g) > > Level values are automatically chosen in this example but you > can > provide the number of values or a sequence of them. > > Note that no extrapolation is done outside convex hull defined > by input > data. > > Goyo > > El sáb, 20-09-2008 a las 11:13 +0200, Oz Nahum escribió: > > > I'm trying again to understand how to plot scattered data > from array into > > contour graph. > > I looked at > > > > http://www.scipy.org/Cookbook/Matplotlib/Gridding_irregularly_spaced_data > > and I understand I have to grid my data. However, in most > samples the plot > > is of a function. > > Let's say I want to plot some geological data, suppose > water table head, and > > I have the following 3D aray > > x y head > > head = ((0, 0, 10), > > (1, 0, 13), > > (2, 0, 11), > > (3, 0, 12), > > (1, 2, 11)) > > matplotlib has lot's of restrictions about how I can plot > and interpolate > > the data, which causes a lot of confusion in my side... > > I'll be happy if someone could supply me a clue of how to > plot contours of > > data which comes in arrays or raster format and not an > equation. > > Thanks, > > Oz > > > > > > > ------------------------------------------------------------------------- > > This SF.Net email is sponsored by the Moblin Your Move > Developer's challenge > > Build the coolest Linux based applications with Moblin SDK & > win great prizes > > Grand prize is a trip for two to an Open Source event > anywhere in the world > > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > > _______________________________________________ > > Matplotlib-users mailing list > > Matplotlib-users@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > > > > > -- > .''`. > : :' : We are debian.org. Lower your prices, > `. `' surrender your code. > `- We will add your hardware and software > distinctiveness to our own. > Resistance is futile. > > ---- > Imagine there's no countries > It isn't hard to do > Nothing to kill or die for > And no religion too > Imagine all the people > Living life in peace > ---- > You all must read 'The God Delusion' > http://en.wikipedia.org/wiki/The_God_Delusion > --- > when one person suffers from a delusion it is called insanity. When > many people suffer from a delusion it is called religion." > Robert Pirsig, Zen and the Art of Motorcycle Maintenance > > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
