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[Octave-bug-tracker] [bug #49989] cheby2 row vector instead of col vecto
From: |
Nicholas Jankowski |
Subject: |
[Octave-bug-tracker] [bug #49989] cheby2 row vector instead of col vector output (matlab compatibility) |
Date: |
Thu, 5 Jan 2017 18:06:54 +0000 (UTC) |
User-agent: |
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0 |
URL:
<http://savannah.gnu.org/bugs/?49989>
Summary: cheby2 row vector instead of col vector output
(matlab compatibility)
Project: GNU Octave
Submitted by: nrjank
Submitted on: Thu 05 Jan 2017 06:06:53 PM GMT
Category: Octave Forge Package
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Matlab Compatibility
Status: None
Assigned to: None
Originator Name: Nicholas Jankowski
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: 4.2.0
Operating System: Any
_______________________________________________________
Details:
a rather minor point discovered while looking into other issues with the
cheby2 output, but in Matlab 2016b the output for the three parameter outputs
from cheby2 are a column vectors, not row vectors. see below:
Octave 4.2.0 with signal package 1.3.2 produces a row vector for both 2 and 3
output forms (col vector shown for easier display):
>> [B,A] = cheby2 (6, 40, [.529, 491] ./ 500);
>> B',A'
ans =
8.90541716849785e-001
-4.25665492382555e-003
-5.33467290744681e+000
1.27494736456810e-002
1.33238571650098e+001
-8.49283328956992e-003
-1.77594519196901e+001
-8.49283328957783e-003
1.33238571650098e+001
1.27494736456818e-002
-5.33467290744681e+000
-4.25665492382585e-003
8.90541716849786e-001
ans =
1.000000000000000
-0.210723363038901
-5.736976149830144
0.993069856933727
13.750880097196202
-1.875521271354126
-17.622691144507598
1.774180136499473
12.733794662040827
-0.840544043983077
-4.918069100804973
0.159535771399183
0.793064549449763
>> [z, p, k] = cheby2 (6, 40, [.529, 491] ./ 500);
>> z',p',k
ans =
-0.998508536714621 - 0.054595806689042i
-0.999200417981141 - 0.039981554575987i
-0.999892834857655 - 0.014639631153939i
0.999999629939819 - 0.000860302403063i
0.999997237948947 - 0.002350339225981i
0.999994846158521 - 0.003210553908087i
0.999994846158521 + 0.003210553908087i
0.999997237948947 + 0.002350339225988i
0.999999629939819 + 0.000860302403063i
-0.999892834857655 + 0.014639631153939i
-0.999200417981141 + 0.039981554575987i
-0.998508536714621 + 0.054595806689042i
ans =
0.999127933531105 - 0.004541708147102i
0.997641561439144 - 0.003320150100321i
0.996786037682028 - 0.001214339758741i
0.996786037682028 + 0.001214339758741i
0.997641561439140 + 0.003320150100324i
0.999127933531105 + 0.004541708147102i
-0.982512668323050 + 0.076121922741012i
-0.959189288744979 + 0.054388983584852i
-0.946491894064797 + 0.019639416902708i
-0.946491894064797 - 0.019639416902708i
-0.959189288744978 - 0.054388983584852i
-0.982512668323050 - 0.076121922741012i
k = 0.890541716849785
Matlab 2016b output:
>> [B,A] = cheby2 (6, 40, [.529, 491] ./ 500);
>> B',A'
ans =
0.890541716849784
-0.004256654923828
-5.334672907446804
0.012749473645703
13.323857165009775
-0.008492833289568
-17.759451919690147
-0.008492833289548
13.323857165009830
0.012749473645662
-5.334672907446820
-0.004256654923823
0.890541716849788
ans =
1.000000000000000
-0.210723363038894
-5.736976149830150
0.993069856933699
13.750880097196170
-1.875521271354099
-17.622691144507659
1.774180136499390
12.733794662040875
-0.840544043983065
-4.918069100804970
0.159535771399179
0.793064549449764
>> [z,p,k] = cheby2 (6, 40, [.529, 491] ./ 500)
z =
-0.999892834857654 + 0.014639631153937i
-0.999892834857654 - 0.014639631153937i
-0.998508536714622 + 0.054595806689042i
-0.998508536714622 - 0.054595806689042i
-0.999200417981141 + 0.039981554575986i
-0.999200417981141 - 0.039981554575986i
0.999999629939820 + 0.000860302403068i
0.999999629939820 - 0.000860302403068i
0.999994846158522 + 0.003210553908087i
0.999994846158522 - 0.003210553908087i
0.999997237948947 + 0.002350339225985i
0.999997237948947 - 0.002350339225985i
p =
-0.982512668323059 + 0.076121922741010i
-0.982512668323059 - 0.076121922741010i
-0.959189288744962 + 0.054388983584849i
-0.959189288744962 - 0.054388983584849i
-0.946491894064806 + 0.019639416902724i
-0.946491894064806 - 0.019639416902724i
0.999127933531107 + 0.004541708147103i
0.999127933531107 - 0.004541708147103i
0.997641561439139 + 0.003320150100321i
0.997641561439139 - 0.003320150100321i
0.996786037682028 + 0.001214339758742i
0.996786037682028 - 0.001214339758742i
k =
0.890541716849784
while many functions in the signal package seem to be fine with either a row
or column vector, it would seem there may be cases where code compatibility is
impacted by the difference.
_______________________________________________________
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<http://savannah.gnu.org/bugs/?49989>
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- [Octave-bug-tracker] [bug #49989] cheby2 row vector instead of col vector output (matlab compatibility),
Nicholas Jankowski <=