Learn how easy it is to sync an existing GitHub or Google Code repo to a SourceForge project!

## matplotlib-users

 [Matplotlib-users] Regression in scatter plot? From: Yannick Copin - 2009-12-10 14:37:46 ```Hi, according to the documentation, scatter should accept a 1D float array for color kwarg. Therefore, I thought the following code would work (and I think it worked at some point in the past; I'm currently using matplotlib 0.99.0): import numpy as N from matplotlib import pyplot as P x = N.random.randn(100) y = N.random.randn(100) z = N.random.randn(100)**2 fig = P.figure() ax = fig.add_subplot(1,1,1) cmap = P.matplotlib.cm.jet norm = P.matplotlib.colors.Normalize(vmin=0, vmax=1) sc = ax.scatter(x,y, color=z, cmap=cmap, norm=norm, ) But this crashes with the following error: [...] /data/ycopin/Softs/local/lib/python2.4/site-packages/matplotlib/colors.pyc in to_rgba_array(self, c, alpha) 377 if isinstance(c, np.ndarray): 378 if c.ndim != 2 and c.dtype.kind not in 'SU': --> 379 raise ValueError("Color array must be two-dimensional") 380 if (c.ndim == 2 and c.shape[1] == 4 and c.dtype.kind == 'f'): 381 if (c.ravel() > 1).any() or (c.ravel() < 0).any(): ValueError: Color array must be two-dimensional So my question is: is the documentation just outdated, or is it a regression in scatter? Cheers, -- .~. Yannick COPIN (o:>* Doctus cum libro /V\ Institut de physique nucléaire de Lyon // \\ Université de Lyon - CNRS-IN2P3 /( )\ AIM: YnCopin ICQ: 236931013 ^`~'^ http://snovae.in2p3.fr/ycopin/ ```
 Re: [Matplotlib-users] Regression in scatter plot? From: Pierre de Buyl - 2009-12-10 14:55:37 ```Hello, According to http://matplotlib.sourceforge.net/api/ pyplot_api.html#matplotlib.pyplot.scatter , the keyword argument that takes an array to specify the colors of the individual markers is c. color is interpreted as a color to give to all markers at once. The following works on my computer (matplotlib 0.99.0) : import numpy as N from matplotlib import pyplot as P x = N.random.randn(100) y = N.random.randn(100) z = N.random.randn(100)**2 fig = P.figure() ax = fig.add_subplot(1,1,1) cmap = P.matplotlib.cm.jet norm = P.matplotlib.colors.Normalize(vmin=0, vmax=1) sc = ax.scatter(x,y, c=z, cmap=cmap, norm=norm, ) Le 10 déc. 09 à 14:44, Yannick Copin a écrit : > Hi, > > according to the documentation, scatter should accept a 1D float > array for > color kwarg. Therefore, I thought the following code would work > (and I think > it worked at some point in the past; I'm currently using matplotlib > 0.99.0): > > import numpy as N > from matplotlib import pyplot as P > > x = N.random.randn(100) > y = N.random.randn(100) > z = N.random.randn(100)**2 > > fig = P.figure() > ax = fig.add_subplot(1,1,1) > > cmap = P.matplotlib.cm.jet > norm = P.matplotlib.colors.Normalize(vmin=0, vmax=1) > > sc = ax.scatter(x,y, > color=z, > cmap=cmap, > norm=norm, > ) > > But this crashes with the following error: > > [...] ```