繪製sinx和cosx

# -*- coding:utf-8 -*-

import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(0, 2 * (np.pi))  #numpy.linspace(開始，終值(含終值))，個數)
y1 = np.sin(x)
y2 = np.cos(x)

#畫圖
plt.title('Compare cosx with sinx')  #標題
#plt.plot(x,y)
#常見線的屬性有：color,label,linewidth,linestyle,marker等
plt.plot(x, y1, color='cyan', label='sinx')
plt.plot(x, y2, 'b', label='cosx')#'b'指：color='blue'
plt.legend()  #顯示上面的label
plt.xlabel('x')
plt.ylabel('f(x)')
plt.axis([0, 2*np.pi, -1, 1])#設定座標範圍axis([xmin,xmax,ymin,ymax])
#plt.ylim(-1,1)#僅設定y軸座標範圍
plt.show()
 

結果

python中的小tips

• np.arrage()：開始值、終值和步長建立表示等差數列的一維陣列。得到的結果陣列不包含終值。
• np.linspace()：開始值、終值和元素個數建立表示等差數列的一維陣列，可以通 過endpoint引數指定是否包含終值，預設值為True，即包含終值。
• π：np.pi

一些屬性

線的顏色：

‘b’ blue 
‘g’ green 
‘r’ red 
‘c’ cyan 
‘m’ magenta 
‘y’ yellow 
‘k’ black 
‘w’ white

線的形狀：

‘-’ solid line style 
‘–’ dashed line style 
‘-.’ dash-dot line style 
‘:’ dotted line style
 

點的標記：

‘.’ point marker 
‘,’ pixel marker 
‘o’ circle marker 
‘v’ triangle_down marker 
‘^’ triangle_up marker 
‘<’ triangle_left marker 
‘>’ triangle_right marker 
‘1’ tri_down marker 
‘2’ tri_up marker 
‘3’ tri_left marker 
‘4’ tri_right marker 
‘s’ square marker 
‘p’ pentagon marker 
‘*’ star marker 
‘h’ hexagon1 marker 
‘H’ hexagon2 marker 
‘+’ plus marker 
‘x’ x marker 
‘D’ diamond marker 
‘d’ thin_diamond marker 
‘|’ vline marker 
‘_’ hline marker