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1 # Copyright (C) 1996 Auburn University. All Rights Reserved |
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2 # |
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3 # This file is part of Octave. |
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4 # |
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5 # Octave is free software; you can redistribute it and/or modify it |
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6 # under the terms of the GNU General Public License as published by the |
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7 # Free Software Foundation; either version 2, or (at your option) any |
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8 # later version. |
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9 # |
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10 # Octave is distributed in the hope that it will be useful, but WITHOUT |
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11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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13 # for more details. |
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14 # |
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15 # You should have received a copy of the GNU General Public License |
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16 # along with Octave; see the file COPYING. If not, write to the Free |
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17 # Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. |
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18 |
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19 function m = dgram(a,b) |
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20 # m = dgram(a,b) |
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21 # Return controllability grammian of discrete time system |
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22 # |
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23 # x(k+1) = a x(k) + b u(k) |
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24 # |
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25 # a m a' - m + b*b' = 0 |
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26 |
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27 # Written by A. S. Hodel July 1995 |
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28 |
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29 # let dlyap do the error checking... |
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30 m = dlyap(a,b*b'); |
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31 endfunction |
