在matplotlib
中,我怎样才能将一系列XY值(例如每个在数组或列表中)组合在一起多次绘制(与其他元素一起使用,这是一般的模式要绘制哪些不同的东西)?
我想计算/提取它们一次,然后将它们组合成一个对象/形状,以便在一个命令中正确绘制,而不是总是分别绘制它们:
import matplotlib.pyplot as plt
import numpy
# Simple example
numpy.random.seed(4)
x = range(10)
y = numpy.random.rand(10)
# Create three 'lines' (here, as x-y arrays) with different lenghts
a = numpy.array((x, y*10)).T
b = numpy.array((x[:5]*y[:5], y[:5]**2)).T
c = numpy.array((x[3:7], x[3:7])).T
# Combine a, b, and c in one object to be called many times later
# (this is not a good way to do that)
abc = numpy.concatenate((a, b, c))
# Plot
fig = plt.figure(figsize=(9,3))
ax0 = fig.add_subplot(131)
ax0.plot(a[:,0], a[:,1], color='b')
ax0.plot(b[:,0], b[:,1], color='r')
ax0.plot(c[:,0], c[:,1], color='g')
ax0.set_title("3 lines to be combined")
ax1 = fig.add_subplot(132)
ax1.plot(a[:,0], a[:,1], color='b')
ax1.plot(b[:,0], b[:,1], color='b')
ax1.plot(c[:,0], c[:,1], color='b')
ax1.set_title("Desired output")
ax2 = fig.add_subplot(133)
ax2.plot(abc[:,0], abc[:,1], color='b') # 1-line command
ax2.set_title("Wrong (spaghetti plot)")
编辑
汤姆的回答很好地解决了我的问题,建立在我上面的尝试上(即,在单个数组中进行连接)。任何其他具有不同方法的解决方案仍然欢迎学习新的东西(例如,是否可以构建单个matplotlib对象(Artist
左右)?)。
答案 0 :(得分:2)
如果你想要的只是一种方式来绘制a
,b
和c
,你可以这样做:
ax2.plot(a[:,0], a[:,1], b[:,0], b[:,1], c[:,0], c[:,1], color='b')
修改强>
要使用在原始对象之间仍有换行符的单个对象,可以使用numpy.NaN
来破坏该行。
import matplotlib.pyplot as plt
import numpy
# Simple example
numpy.random.seed(4)
x = range(10)
y = numpy.random.rand(10)
# Create three 'lines' (here, as x-y arrays) with different lenghts
a = numpy.array((x, y*10)).T
b = numpy.array((x[:5]*y[:5], y[:5]**2)).T
c = numpy.array((x[3:7], x[3:7])).T
# Use this to break up the original objects.
# plt.plot does not like NaN's, so will break the line there.
linebreak=[[numpy.NaN,numpy.NaN]]
# Combine a, b, and c in one object to be called many times later
abc = numpy.concatenate((a, linebreak, b, linebreak, c))
# Plot
fig = plt.figure(figsize=(9,3))
ax0 = fig.add_subplot(131)
ax0.plot(a[:,0], a[:,1], color='b')
ax0.plot(b[:,0], b[:,1], color='r')
ax0.plot(c[:,0], c[:,1], color='g')
ax0.set_title("3 lines to be combined")
ax1 = fig.add_subplot(132)
ax1.plot(a[:,0], a[:,1], color='b')
ax1.plot(b[:,0], b[:,1], color='b')
ax1.plot(c[:,0], c[:,1], color='b')
ax1.set_title("Desired output")
ax2 = fig.add_subplot(133)
ax2.plot(abc[:,0], abc[:,1], color='b') # 1-line command
ax2.set_title("Single object with breaks")