[Octave-cvsupdate] SF.net SVN: octave:[10364] trunk/octave-forge/main/control/inst/@lti

[<par...@us...>]

Revision: 10364
          http://octave.svn.sourceforge.net/octave/?rev=10364&view=rev
Author:   paramaniac
Date:     2012-05-05 06:48:41 +0000 (Sat, 05 May 2012)
Log Message:
-----------
control: explain difference between ctranspose and transpose more clearly

Modified Paths:
--------------
    trunk/octave-forge/main/control/inst/@lti/ctranspose.m
    trunk/octave-forge/main/control/inst/@lti/transpose.m

Modified: trunk/octave-forge/main/control/inst/@lti/ctranspose.m
===================================================================
--- trunk/octave-forge/main/control/inst/@lti/ctranspose.m	2012-05-05 00:05:09 UTC (rev 10363)
+++ trunk/octave-forge/main/control/inst/@lti/ctranspose.m	2012-05-05 06:48:41 UTC (rev 10364)
@@ -16,7 +16,16 @@
 ## along with LTI Syncope.  If not, see <http://www.gnu.org/licenses/>.
 
 ## -*- texinfo -*-
-## Conjugate transpose of LTI objects.  Used by Octave for "sys'".
+## Conjugate transpose or pertransposition of LTI objects.
+## Used by Octave for "sys'".
+## For a transfer-function matrix G, G' denotes the conjugate
+## of G given by G.'(-s) for a continuous-time system or G.'(1/z)
+## for a discrete-time system.
+## The frequency response of the pertransposition of G is the
+## Hermitian (conjugate) transpose of G(jw), i.e.
+## freqresp (G', w) = freqresp (G, w)'.
+## @strong{WARNING:} Do @strong{NOT} use this for dual problems,
+## use the transpose "sys.'" (note the dot) instead.
 
 ## Author: Lukas Reichlin <luk...@gm...>
 ## Created: May 2012

Modified: trunk/octave-forge/main/control/inst/@lti/transpose.m
===================================================================
--- trunk/octave-forge/main/control/inst/@lti/transpose.m	2012-05-05 00:05:09 UTC (rev 10363)
+++ trunk/octave-forge/main/control/inst/@lti/transpose.m	2012-05-05 06:48:41 UTC (rev 10364)
@@ -17,6 +17,8 @@
 
 ## -*- texinfo -*-
 ## Transpose of LTI objects.  Used by Octave for "sys.'".
+## Useful for dual problems, i.e. controllability and observability
+## or designing estimator gains with @command{lqr} and @command {place}.
 
 ## Author: Lukas Reichlin <luk...@gm...>
 ## Created: February 2010

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