[Scipy-svn] r5000 - trunk/scipy/signal
scipy-svn@scip...
scipy-svn@scip...
Thu Nov 6 05:56:47 CST 2008
Author: cdavid
Date: 2008-11-06 05:56:24 -0600 (Thu, 06 Nov 2008)
New Revision: 5000
Modified:
trunk/scipy/signal/filter_design.py
Log:
Mention the warning in tf2zpk and zpk2tf.
Modified: trunk/scipy/signal/filter_design.py
===================================================================
--- trunk/scipy/signal/filter_design.py 2008-11-06 11:55:41 UTC (rev 4999)
+++ trunk/scipy/signal/filter_design.py 2008-11-06 11:56:24 UTC (rev 5000)
@@ -124,6 +124,9 @@
def tf2zpk(b,a):
"""Return zero, pole, gain (z,p,k) representation from a numerator,
denominator representation of a linear filter.
+
+ If some values of b are too close to 0, they are removed. In that case, a
+ BadCoefficients warning is emitted.
"""
b,a = normalize(b,a)
b = (b+0.0) / a[0]
@@ -146,6 +149,9 @@
Outputs: (b,a)
b, a --- numerator and denominator polynomials.
+
+ If some values of b are too close to 0, they are removed. In that case, a
+ BadCoefficients warning is emitted.
"""
z = atleast_1d(z)
k = atleast_1d(k)
@@ -163,6 +169,9 @@
def normalize(b,a):
"""Normalize polynomial representation of a transfer function.
+
+ If values of b are too close to 0, they are removed. In that case, a
+ BadCoefficients warning is emitted.
"""
b,a = map(atleast_1d,(b,a))
if len(a.shape) != 1:
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