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c2d is a Stub that only Produces Error Messages


From: Thomas D. Dean
Subject: c2d is a Stub that only Produces Error Messages
Date: Mon, 21 Feb 2011 20:59:21 -0800

Octave 3.4.0, control 2.0.0
>From the Converting from S to Z domain thread,

octave:1> num = [1 0];den = [1 0 4];
octave:2> sys = tf(num, den,1);sysz=c2d(sys,1);sysout(sysz,'tf')
error: tf: c2d: not implemented yet
error: called from:
error:   /home/tomdean/octave/control-2.0.0/@tf/__c2d__.m at line 31,
         column 7
error:   /home/tomdean/octave/control-2.0.0/@lti/c2d.m at line 46,
         column 7

Looks like __c2d__ is a stub that only displays error messages, either
"not implemented" or "invalid method".

# cat /home/tomdean/octave/control-2.0.0/@tf/__c2d__.m
...<snip>
function sys = __c2d__ (sys, tsam, method = "zoh")

  [p, m] = size (sys);

  switch (method)
    case {"zoh", "std"}
      error ("tf: c2d: not implemented yet");

    otherwise
      error ("tf: c2d: %s is an invalid method", method);

  endswitch

endfunction

tomdean




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