I am having trouble using the polyfit function. Here are the
commands:
import numpy as np
import scipy as sc
vp = np.array([1.0, 5.0, 10.0, 20.0, 40.0, 60.0, 100.0, 200.0, 400.0,
760.0])
T = np.array([-36.7, -19.6, -11.5, -2.6, 7.6, 15.4, 26.1, 42.2, 60.6,
80.1])
(a,b,c,d) = np.polyfit(vp,T,3)
and I get the following error message which I don't understand.
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/notebook/sage_notebook/worksheets/admin/7/code/7.py",
line 7, in <module>
(a,b,c,d) = np.polyfit(vp,T,_sage_const_3 )
File "/usr/local/sage/local/lib/python2.5/site-packages/
zope.interface-3.3.0-py2.5-linux-i686.egg/", line 1, in <module>
File "/usr/local/sage/local/lib/python2.5/site-packages/numpy/lib/
polynomial.py", line 493, in polyfit
rcond = len(x)*finfo(x.dtype).eps
File "/usr/local/sage/local/lib/python2.5/site-packages/numpy/lib/
getlimits.py", line 98, in __new__
raise ValueError, "data type %r not inexact" % (dtype)
ValueError: data type <type 'numpy.object_'> not inexact
I have checked www.scipy.org with the associated documentation, the
sage help documentation, the numpy docs and it appears that I am using
the function correctly. I'm stumped... I'm interested in developing
an online class using sage for chemical engineering calculations.
Thanks.
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