PythonQ 240-8XX Manual de usuario descargar pdf (Pagina 5)

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AtasteofNumPy:aleast-squaresprocedure

x=linspace(0.0,1.0,n) #coordinates

y_line = -2

x+3

y=y_line+random.normal(0,0.25,n) #linewithnoise

#goal:fitalinetothedatapointsx,y

#createandsolveleastsquaressystem:

A=array([x,ones(n)])

A=A.transpose()

result = linalg.lstsq(A, y)

#resultisa4-tuple,thesolution(a,b)isthe1stentry:

a, b = result[0]

plot(x, y, ’o’, # data points w/noise

x, y_line, ’r’, # original line

x, a

x+b,’b’) #fittedlines

legend(’data points’, ’original line’, ’fitted line’)

hardcopy(’myplot.png’)

Numerical Python – p. 239/728

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PythonQ 240-8XX Manual de usuario Pagina 5