[Scipy-tickets] [SciPy] #1812: Erratic phase plot for high order filters

SciPy Trac scipy-tickets@scipy....
Thu Jan 24 22:27:35 CST 2013


#1812: Erratic phase plot for high order filters
--------------------------+-------------------------------------------------
 Reporter:  kitmonisit    |       Owner:  cdavid     
     Type:  defect        |      Status:  new        
 Priority:  normal        |   Milestone:  Unscheduled
Component:  scipy.signal  |     Version:  0.11.0     
 Keywords:                |  
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Comment(by kitmonisit):

 I looked up the code for {{{scipy.signal.lti.bode}}} If I remember
 correctly, it uses the two-argument arctangent, which returns the angle in
 radians from [0 to pi) or [0 to -pi]. When converting that to degrees,
 naturally everything wraps around, limiting the angles to below |180|
 degrees.

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Ticket URL: <http://projects.scipy.org/scipy/ticket/1812#comment:3>
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