Plots data points and the fitting polynomial using Python
''' plotPoly(xData,yData,coeff)
Plots data points and the fitting
polynomial defined by its coefficient
array {coeff} = {a0, a1. ...}
'''
from numpy import zeros,arange
from xyPlot import *
def plotPoly(xData,yData,coeff):
m = len(coeff)
x1 = min(xData)
x2 = max(xData)
dx = (x2 - x1)/20.0
x = arange(x1,x2 + dx/10.0,dx)
y = zeros((len(x)))*1.0
for i in range(m):
y = y + coeff[i]*x**i
xyPlot(xData,yData,'no',x,y,'ln')
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