Mercurial > forge
comparison FIXES/zp2tf.m @ 0:6b33357c7561 octave-forge
Initial revision
| author | pkienzle |
|---|---|
| date | Wed, 10 Oct 2001 19:54:49 +0000 |
| parents | |
| children | 7d7fa9c17d3d |
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| -1:000000000000 | 0:6b33357c7561 |
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| 1 ## Copyright (C) 1999 Paul Kienzle | |
| 2 ## | |
| 3 ## This program is free software; you can redistribute it and/or modify | |
| 4 ## it under the terms of the GNU General Public License as published by | |
| 5 ## the Free Software Foundation; either version 2 of the License, or | |
| 6 ## (at your option) any later version. | |
| 7 ## | |
| 8 ## This program is distributed in the hope that it will be useful, | |
| 9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 11 ## GNU General Public License for more details. | |
| 12 ## | |
| 13 ## You should have received a copy of the GNU General Public License | |
| 14 ## along with this program; if not, write to the Free Software | |
| 15 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 16 | |
| 17 ## usage: [b, a] = zp2tf(z, p, g) | |
| 18 ## | |
| 19 ## Convert to transfer function f(x)=sum(b*x^n)/sum(a*x^n) from | |
| 20 ## zero-pole-gain form f(x)=g*prod(1-z*x)/prod(1-p*x) | |
| 21 | |
| 22 function [b, a] = zp2tf(z, p, g) | |
| 23 if nargin != 3 || nargout != 2 | |
| 24 usage("[b, a] = zp2tf(z, p, g)"); | |
| 25 endif | |
| 26 try cplxpair(z); catch error("zp2tf: could not pair complex zeros"); end | |
| 27 try cplxpair(p); catch error("zp2tf: could not pair complex poles"); end | |
| 28 b = g*real(poly(z)); | |
| 29 a = real(poly(p)); | |
| 30 endfunction |