我想绘制一些数据使用Matplotlib的二维散点图函数,同时在x和y轴上生成投影直方图。我发现的例子来自matplotlib图片库(pylab_examples example code: scatter_hist.py)。Matplotlib散点图和直方图
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.ticker import NullFormatter
# the random data
x = np.random.randn(1000)
y = np.random.randn(1000)
nullfmt = NullFormatter() # no labels
# definitions for the axes
left, width = 0.1, 0.65
bottom, height = 0.1, 0.65
bottom_h = left_h = left+width+0.02
rect_scatter = [left, bottom, width, height]
rect_histx = [left, bottom_h, width, 0.2]
rect_histy = [left_h, bottom, 0.2, height]
# start with a rectangular Figure
plt.figure(1, figsize=(8,8))
axScatter = plt.axes(rect_scatter)
axHistx = plt.axes(rect_histx)
axHisty = plt.axes(rect_histy)
# no labels
axHistx.xaxis.set_major_formatter(nullfmt)
axHisty.yaxis.set_major_formatter(nullfmt)
# the scatter plot:
axScatter.scatter(x, y)
# now determine nice limits by hand:
binwidth = 0.25
xymax = np.max([np.max(np.fabs(x)), np.max(np.fabs(y))])
lim = (int(xymax/binwidth) + 1) * binwidth
axScatter.set_xlim((-lim, lim))
axScatter.set_ylim((-lim, lim))
bins = np.arange(-lim, lim + binwidth, binwidth)
axHistx.hist(x, bins=bins)
axHisty.hist(y, bins=bins, orientation='horizontal')
axHistx.set_xlim(axScatter.get_xlim())
axHisty.set_ylim(axScatter.get_ylim())
plt.show()
唯一的问题是该示例不起作用。我收到以下错误:
~$ python ~/Desktop/scatter_and_hist.py
Traceback (most recent call last):
File "/Users/username/Desktop/scatter_and_hist.py", line 45, in <module>
axHisty.hist(y, bins=bins, orientation='horizontal')
File "//anaconda/lib/python2.7/site-packages/matplotlib/axes.py", line 8180, in hist
color=c, bottom=bottom)
TypeError: barh() got multiple values for keyword argument 'bottom'
我已经通过代码并隔离了问题。它是导致问题的第45行(axHisty.hist(y,bin = bin,orientation ='horizontal'))。在图像库中看到你想要的情节是非常令人沮丧的,但是这个例子不起作用。第二套眼睛将不胜感激!
请将代码量减少到_minimum_所需的_minimum_以重现错误并超过_full_堆栈跟踪。 – tacaswell
和你使用的是什么版本的matplotlib?我认为你遇到了一个错误。 – tacaswell
下次我会尽量减少代码。大部分是必要的,仅仅是因为我想让人们看到我使用的是哪些边界和哪些数据。我正在使用matplotlib版本1.2.1。现在包含完整的堆栈跟踪。另外,我刚刚在我的另一台计算机上使用默认的matplotlibrc文件和非anaconda打包的分发版本尝试了这些,因此这两者似乎都不是原因。 – astromax