基本使用

import matplotlib.pyplot as plt

import numpy as np

x = np.linspace(-1,1,50)

y = 2*x+1

plt.figure(num=2,figsize=(8,5))

plt.plot(x,y)

plt.figure(num=1)

y2 = x**2

plt.plot(x,y2,color='red',linewidth=1.0,linestyle='--') # 默認 線寬為1

plt.show()

感受一波被繁多參數支配的恐懼

import matplotlib.pyplot as plt

import numpy as np

x = np.linspace(-4,4,10)

y = 2*x+1

ax = plt.gca()

ax.spines['top'].set_color('none')

ax.spines['right'].set_color('none')

xaxis = ax.xaxis

yaxis = ax.yaxis

xaxis.set_ticks_position('bottom')

yaxis.set_ticks_position('left')

left_ax = ax.spines['left']

bottom_ax = ax.spines['bottom']

left_ax.set_color('red')

bottom_ax.set_color('green')

left_ax.set_position(('data',0))

bottom_ax.set_position(('data',0))

x0 = 1

y0 = 2*x0+1

plt.scatter(x0,y0,s=50,color='b')

plt.plot([x0,x0],[y0,0],'k--',linewidth=2.5)

plt.annotate(r'$2x+1=%s$' %y0,xy=(x0,y0),xycoords='data',xytext=(+30,-30),textcoords='offset points',fontsize=16,arrowprops=dict(arrowstyle='->',connectionstyle='arc3,rad=.2'))

plt.text(-7,3,r'$This\ is\ the\ some text.\ \mu\ \sigma_i\ \alpha_t $',fontdict={'size':16,'color':'red'})

plt.plot(x,y,color='b')

plt.show()

總結

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