[英]PyPlot does not plot image
I created the following test code, and the code runs fine. 我创建了以下测试代码,代码运行正常。 But the plot does not appear when executed. 但是这个情节在执行时不会出现。 Did I miss something? 我错过了什么? I use pyplot to create the plots. 我使用pyplot来创建绘图。 When I use plt.savefig("test.png") the chart is created and saved. 当我使用plt.savefig(“test.png”)时,会创建并保存图表。
import numpy
import matplotlib
matplotlib.use('agg')
import matplotlib.pyplot as plt
from studentRegression import studentReg
from class_vis import prettyPicture, output_image
from ages_net_worth import ageNetWorthData
ages_train, ages_test, net_worths_train, net_worth_test = ageNetWorthData()
plt.clf()
plt.scatter(ages_train, net_worths_train, color="b", label="train data")
plt.legend(loc=2)
plt.xlabel("ages")
plt.ylabel("net worths")
plt.show()
def ageNetWorthData():
random.seed(42)
numpy.random.seed(42)
ages = []
for ii in range(100):
ages.append( random.randint(20,65) )
net_worths = [ii * 6.25 + numpy.random.normal(scale=40.) for ii in ages]
### need massage list into a 2d numpy array to get it to work in LinearRegression
ages = numpy.reshape( numpy.array(ages), (len(ages), 1))
net_worths = numpy.reshape( numpy.array(net_worths), (len(net_worths), 1))
from sklearn.cross_validation import train_test_split
ages_train, ages_test, net_worths_train, net_worths_test = train_test_split(ages, net_worths)
return ages_train, ages_test, net_worths_train, net_worths_test
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