Re: [Matplotlib-users] Bug in polyfit

[John H. <jdh...@ac...>]

>>>>> "Axel" == Axel Kowald <A.K...@gm...> writes:

    Axel> Hi, I'm using matplotlib 0.71 and I think I found a bug in
    Axel> polyfit.

    Axel> This simple linear regression on two data points gives the
    Axel> correct answer:
    >>>> polyfit([731.924,731.988],[915,742],1)
                       ^^^^
                     floats
    Axel> However, if I multiply my x values by 1000 the result is
    Axel> wrong:
    >>>> polyfit([731924,731988],[915,742],1)
                       ^^^^
                     integers
 
Both of these should work

print polyfit([731.924,731.988],[915.,742.],1)
print polyfit([731924.,731988.],[915.,742.],1)

I fixed the polyfit code to explicitly convert the input arrays to
floats arrays, which fixes this bug.

Thanks for the report.

JDH