2D直方图与Python [英] 2D histogram with Python

问题描述

我想用这些code绘制Python中的2D直方图

I'm trying to plot a 2D histogram in Python using these code

from math import *
import pylab as p
import matplotlib.pyplot as plt
import numpy as np

x=part.points[:,0]
y=part.points[:,1]
z=part.points[:,2]

H, xedges, yedges = np.histogram2d(x, y, bins=(128,128))
H.shape, xedges.shape, yedges.shape

extent = [yedges[0], yedges[-1], xedges[-1], xedges[0]]

plt.imshow(H, extent=extent, interpolation='nearest')

plt.colorbar()
plt.xlabel("x")
plt.ylabel("y")
plt.show()

每一件事情正常工作：我有重新present计数在每一个细胞中的彩条。问题是，我想有计数，但功能histrogram2d的日志不具有任何选项。

Every thing works fine: I have a color bar which represent the counts in each cells. The thing is that I would like to have the log of the count but the function histrogram2d does not have any option for that.

推荐答案

我想，你可以简单地做

H_log = np.log(H)
…
plt.imshow(H_log,…)

（假设你没有空计数）。

(assuming that you don't have null counts).

如果你想有一个三维条形图，而不是，您可以调整例如在Matplotlib文档中提供。

If you want a 3D bar chart instead, you can adapt the example provided in the Matplotlib documentation.

更一般地，我衷心建议您检查非常有用的 Matplotlib库，当你寻找一些具体的图形功能。

More generally, I heartily recommend that you check the very useful Matplotlib gallery, when you are looking for some specific graphing capabilities.

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