ValueError with np.polynomial.Polynomial([1]).roots()
np.polynomial.Polynomial([1]) Polynomial([ 1.], [-1., 1.]) np.polynomial.Polynomial([1]).roots() Traceback (most recent call last): File "<pyshell#140>", line 1, in <module> np.polynomial.Polynomial([1]).roots() File "<string>", line 485, in roots File "C:\Programs\Python25\lib\site-packages\numpy\polynomial\polyutils.py",
For the lag polynomials I have cases where the order is zero, but roots raises a ValueError. Is this intended? Then, I need to catch it in my code. I haven't checked yet if my other parts will go through with empty roots. line 280, in mapdomain [x] = as_series([x], trim=False) File "C:\Programs\Python25\lib\site-packages\numpy\polynomial\polyutils.py", line 137, in as_series raise ValueError("Coefficient array is empty") ValueError: Coefficient array is empty Josef
On Fri, Oct 29, 2010 at 10:41 AM, <josef.pktd@gmail.com> wrote:
For the lag polynomials I have cases where the order is zero, but roots raises a ValueError.
Is this intended? Then, I need to catch it in my code. I haven't checked yet if my other parts will go through with empty roots.
np.polynomial.Polynomial([1]) Polynomial([ 1.], [-1., 1.]) np.polynomial.Polynomial([1]).roots() Traceback (most recent call last): File "<pyshell#140>", line 1, in <module> np.polynomial.Polynomial([1]).roots() File "<string>", line 485, in roots File "C:\Programs\Python25\lib\site-packages\numpy\polynomial\polyutils.py", line 280, in mapdomain [x] = as_series([x], trim=False) File "C:\Programs\Python25\lib\site-packages\numpy\polynomial\polyutils.py", line 137, in as_series raise ValueError("Coefficient array is empty") ValueError: Coefficient array is empty
This has been fixed in trunk to return an empty array: In [2]: import numpy.polynomial as poly In [3]: p = poly.Polynomial([1]) In [4]: p Out[4]: Polynomial([ 1.], [-1., 1.]) In [5]: p.roots() Out[5]: array([], dtype=float64) What version are you seeing this in? Chuck
On Fri, Oct 29, 2010 at 12:50 PM, Charles R Harris <charlesr.harris@gmail.com> wrote:
On Fri, Oct 29, 2010 at 10:41 AM, <josef.pktd@gmail.com> wrote:
For the lag polynomials I have cases where the order is zero, but roots raises a ValueError.
Is this intended? Then, I need to catch it in my code. I haven't checked yet if my other parts will go through with empty roots.
np.polynomial.Polynomial([1]) Polynomial([ 1.], [-1., 1.]) np.polynomial.Polynomial([1]).roots() Traceback (most recent call last): File "<pyshell#140>", line 1, in <module> np.polynomial.Polynomial([1]).roots() File "<string>", line 485, in roots File "C:\Programs\Python25\lib\site-packages\numpy\polynomial\polyutils.py", line 280, in mapdomain [x] = as_series([x], trim=False) File "C:\Programs\Python25\lib\site-packages\numpy\polynomial\polyutils.py", line 137, in as_series raise ValueError("Coefficient array is empty") ValueError: Coefficient array is empty
This has been fixed in trunk to return an empty array:
In [2]: import numpy.polynomial as poly
In [3]: p = poly.Polynomial([1])
In [4]: p Out[4]: Polynomial([ 1.], [-1., 1.])
In [5]: p.roots() Out[5]: array([], dtype=float64)
What version are you seeing this in?
I'm old, numpy 1.4.0 empty array is good, it works with the rest so far. Thanks, Josef
Chuck
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