matplotlib学习笔记（一）

'''

'''
from numpy import *
import matplotlib
import matplotlib.pyplot as plt
from matplotlib.patches import Rectangle


n = 1000 #number of points to create
xcord = zeros((n))
print(xcord)#[0. 0.   ]
ycord = zeros((n))
markers =[]
colors =[]
fw = open('testSet.txt','w')
for i in range(n):
    [r0,r1] = random.standard_normal(2)#标准差
    myClass = random.uniform(0,1)
    if (myClass <= 0.16):
        fFlyer = random.uniform(22000, 60000)
        tats = 3 + 1.6*r1
        markers.append(20)
        colors.append(2.1)
        classLabel = 1 #'didntLike'
        print ("%d, %f, class1" % (fFlyer, tats))
    elif ((myClass > 0.16) and (myClass <= 0.33)):
        fFlyer = 6000*r0 + 70000
        tats = 10 + 3*r1 + 2*r0
        markers.append(20)
        colors.append(1.1)
        classLabel = 1 #'didntLike'
        print ("%d, %f, class1" % (fFlyer, tats)) #print("who is the murder? %s or %s?") % (a, b)python2中的写法
    elif ((myClass > 0.33) and (myClass <= 0.66)):
        fFlyer = 5000*r0 + 10000
        tats = 3 + 2.8*r1
        markers.append(30)
        colors.append(1.1)
        classLabel = 2 #'smallDoses'
        print ("%d, %f, class2" % (fFlyer, tats))
    else:
        fFlyer = 10000*r0 + 35000
        tats = 10 + 2.0*r1
        markers.append(50)
        colors.append(0.1)
        classLabel = 3 #'largeDoses'
        print("%d, %f, class3"%(fFlyer, tats))
    if (tats < 0): tats =0
    if (fFlyer < 0): fFlyer =0
    xcord[i] = fFlyer; ycord[i]=tats
    fw.write("%d\t%f\t%f\t%d\n" % (fFlyer, tats, random.uniform(0.0, 1.7), classLabel))

fw.close()
fig = plt.figure()
ax = fig.add_subplot(111)
ax.scatter(xcord,ycord, c=colors, s=markers)
type1 = ax.scatter([-10], [-10], s=20, c='red')
type2 = ax.scatter([-10], [-15], s=30, c='green')
type3 = ax.scatter([-10], [-20], s=50, c='blue')
ax.legend([type1, type2, type3], ["Class 1", "Class 2", "Class 3"], loc=2)
#ax.axis([-5000,100000,-2,25])
plt.xlabel('Frequent Flyier Miles Earned Per Year')
plt.ylabel('Percentage of Body Covered By Tatoos')
plt.show()