[英]matplotlib colorbar and histogram with shared axis
我想显示带有imshow
的二维np.array
以及应该与imshow
的直方图共享其轴的各个np.array
。 但是,这是没有共享轴的尝试。
import numpy as np
import matplotlib.pyplot as plt
from matplotlib import cm
from mpl_toolkits.axes_grid1 import make_axes_locatable
fig, ax = plt.subplots(figsize=(7,10))
data = np.random.normal(0, 0.2, size=(100,100))
cax = ax.imshow(data, interpolation='nearest', cmap=cm.jet)
divider = make_axes_locatable(plt.gca())
axBar = divider.append_axes("bottom", '5%', pad='7%')
axHist = divider.append_axes("bottom", '30%', pad='7%')
cbar = plt.colorbar(cax, cax=axBar, orientation='horizontal')
axHist.hist(np.ndarray.flatten(data), bins=50)
plt.show()
我试图用sharex
在参数axHist
与axHist = divider.append_axes("bottom", '30%', pad='7%', sharex=axBar)
但是这在某种程度上将这个直方图数据:
除了共享轴x之外,如何修改直方图以采用与颜色图相同的颜色,类似于此处 ?
您可以按bin值为直方图的每个色块着色,而无需sharex:
import numpy as np
import matplotlib.pyplot as plt
from matplotlib import cm
from mpl_toolkits.axes_grid1 import make_axes_locatable
from matplotlib.colors import Normalize
fig, ax = plt.subplots(figsize=(7,10))
data = np.random.normal(0, 0.2, size=(100,100))
cax = ax.imshow(data, interpolation='nearest', cmap=cm.jet)
divider = make_axes_locatable(plt.gca())
axBar = divider.append_axes("bottom", '5%', pad='7%')
axHist = divider.append_axes("bottom", '30%', pad='7%')
cbar = plt.colorbar(cax, cax=axBar, orientation='horizontal')
# get hist data
N, bins, patches = axHist.hist(np.ndarray.flatten(data), bins=50)
norm = Normalize(bins.min(), bins.max())
# set a color for every bar (patch) according
# to bin value from normalized min-max interval
for bin, patch in zip(bins, patches):
color = cm.jet(norm(bin))
patch.set_facecolor(color)
plt.show()
有关更多信息,请查找手册页: https : //matplotlib.org/xkcd/examples/pylab_examples/hist_colormapped.html
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