[Tutor] (no subject)

[Rocko Brown]

Hello,

I am trying to generate a 2D histogram for two arrays of data in CSV
format.

The code is:

x, y = '5k_vec.csv','tcd_5k.csv'
H, xedges, yedges = np.histogram2d(x, y)
H.shape, xedges.shape, yedges.shape

# We can now use the Matplotlib to visualize this 2-dimensional histogram:

extent = [yedges[0], yedges[-1], xedges[-1], xedges[0]]
import matplotlib.pyplot as plt
plt.imshow(H, extent=extent, interpolation='nearest')
# <matplotlib.image.AxesImage object at ...>
plt.colorbar()
# <matplotlib.colorbar.Colorbar instance at ...>
plt.show()

And the errors I am getting on Wakari are:

TypeError                                 Traceback (most recent call
last)<ipython-input-3-d8604c85925d> in <module>()      1 x, y =
'5k_vec.csv','tcd_5k.csv'----> 2 H, xedges, yedges = np.histogram2d(x,
y)      3 H.shape, xedges.shape, yedges.shape      4       5 # We can
now use the Matplotlib to visualize this 2-dimensional histogram:
/opt/anaconda/envs/np17py27-1.5/lib/python2.7/site-packages/numpy/lib/twodim_base.pyc
in histogram2d(x, y, bins, range, normed, weights)    609
xedges = yedges = asarray(bins, float)    610         bins = [xedges,
yedges]--> 611     hist, edges = histogramdd([x,y], bins, range,
normed, weights)    612     return hist, edges[0], edges[1]    613
/opt/anaconda/envs/np17py27-1.5/lib/python2.7/site-packages/numpy/lib/function_base.pyc
in histogramdd(sample, bins, range, normed, weights)    307
 smax = ones(D)    308         else:--> 309             smin =
atleast_1d(array(sample.min(0), float))    310             smax =
atleast_1d(array(sample.max(0), float))    311     else:
/opt/anaconda/envs/np17py27-1.5/lib/python2.7/site-packages/numpy/core/_methods.pyc
in _amin(a, axis, out, keepdims)     12 def _amin(a, axis=None,
out=None, keepdims=False):     13     return um.minimum.reduce(a,
axis=axis,---> 14                             out=out,
keepdims=keepdims)     15      16 def _sum(a, axis=None, dtype=None,
out=None, keepdims=False):
TypeError: cannot perform reduce with flexible type

Any help would be appreciated!






-- 
*Rocko Brown*, MS, EIT
PhD Candidate
Department of Land, Air, & Water Resources
University of California, Davis
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