[英]matplotlib colormap: do not resize
我正在使用matplotlib繪制一個混淆矩陣:
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.gridspec as gridspec
conf_arr_hs = [[90, 74],
[33, 131]]
norm_conf_hs = []
for i in conf_arr_hs:
a = 0
tmp_arr = []
a = sum(i, 0)
for j in i:
tmp_arr.append(float(j)/float(a))
norm_conf_hs.append(tmp_arr)
confmatmap=cm.binary
fig = plt.figure()
plt.clf()
ax = fig.add_subplot(111)
res = ax.imshow(np.array(norm_conf_hs), cmap=confmatmap, interpolation='nearest')
for x in xrange(2):
for y in xrange(2):
textcolor = 'black'
if norm_conf_hs[x][y] > 0.5:
textcolor = 'white'
ax.annotate("%0.2f"%norm_conf_hs[x][y], xy=(y, x), horizontalalignment='center', verticalalignment='center', color=textcolor)]
但matplotlib似乎會自動調整顏色變化范圍:左下方網格應為淺灰色,因為其對應值為0.2而不是0.0。 同樣,右下方網格應為深灰色,因為它是0.8而不是1。
我想我錯過了任命顏色映射動態范圍的步驟。 我對matplotlib的文檔進行了一些研究,但沒有找到我想要的東西。
要顯式設置顏色映射范圍,您需要使用set_clim
命令:
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.gridspec as gridspec
plt.ion()
conf_arr_hs = [[90, 74],
[33, 131]]
norm_conf_hs = []
for i in conf_arr_hs:
a = 0
tmp_arr = []
a = sum(i, 0)
for j in i:
tmp_arr.append(float(j)/float(a))
norm_conf_hs.append(tmp_arr)
confmatmap=plt.cm.binary
fig = plt.figure()
plt.clf()
ax = fig.add_subplot(111)
res = ax.imshow(np.array(norm_conf_hs), cmap=confmatmap, interpolation='nearest')
res.set_clim(0,1) # set the limits for your color map
for x in xrange(2):
for y in xrange(2):
textcolor = 'black'
if norm_conf_hs[x][y] > 0.5:
textcolor = 'white'
ax.annotate("%0.2f"%norm_conf_hs[x][y], xy=(y, x), horizontalalignment='center', verticalalignment='center', color=textcolor)
在這里查看更多信息: http : //matplotlib.org/api/cm_api.html
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