[Scipy-tickets] [SciPy] #1468: SciPy calculates zeroth mathieu_sem as non-zero value

SciPy Trac scipy-tickets@scipy....
Thu Jun 30 05:12:28 CDT 2011


#1468: SciPy calculates zeroth mathieu_sem as non-zero value
---------------------------+------------------------------------------------
 Reporter:  Nikolay        |       Owner:  pv         
     Type:  defect         |      Status:  new        
 Priority:  high           |   Milestone:  Unscheduled
Component:  scipy.special  |     Version:  0.9.0      
 Keywords:  mathieu        |  
---------------------------+------------------------------------------------
 I'm working with Mathieu functions. {{{SciPy}}} is more comfortable for
 me, than {{{GSL}}}.
 I have {{{GSL 1.15, SciPy 0.9.0-r1}}}. Both from gentoo amd64 portage
 tree.

 It is well known, that eigenvalue '''b0''' for the odd solution
 [http://dlmf.nist.gov/28.2#F1 b0 is not exist]. Therefore the zeroth odd
 Mathieu function '''se''' is equal to zero.

 I wrote two small programs - for {{{SciPy}}} and {{{GSL}}} to demonstrate
 the behavior.
 {{{GSL}}} one exits with error, but {{{SciPy}}} calculates both '''b'''
 and '''se''' values.

 Please confirm and fix this bug.

-- 
Ticket URL: <http://projects.scipy.org/scipy/ticket/1468>
SciPy <http://www.scipy.org>
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