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1 function zr = tzero (a, b, c, d, bal) |
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2 |
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3 # Usage: zr = tzero (a, b, c, d, bal) |
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4 # |
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5 # Compute the transmission zeros of a, b, c, d. |
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6 # |
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7 # bal = balancing option (see balance); default is "B". |
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8 # |
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9 # Needs to incorporate mvzero algorithm to isolate finite zeros. |
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10 |
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11 # Written by A. S. Hodel (scotte@eng.auburn.edu) August 1993. |
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12 |
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13 if (nargin == 4) |
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14 bal = "B"; |
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15 elseif (nargin != 5) |
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16 error ("tzero: illegal number of arguments"); |
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17 endif |
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18 |
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19 [n, m, p] = abcddim (a, b, c, d); |
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20 |
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21 if (n > 0 && m > 0 && p > 0) |
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22 if (m != p) |
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23 fprintf (stderr "tzero: number of inputs,outputs differ. squaring up"); |
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24 if (p > m) |
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25 fprintf (stderr, " by padding b and d with zeros."); |
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26 b = [b, zeros (n, p-m)]; |
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27 d = [d, zeros (p, p-m)]; |
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28 m = p; |
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29 else |
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30 fprintf (stderr, " by padding c and d with zeros."); |
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31 c = [c; zeros (m-p, n)]; |
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32 d = [d; zeros (m-p, m)]; |
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33 p = m; |
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34 endif |
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35 fprintf (stderr, "This is a kludge. Try again with SISO system."); |
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36 endif |
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37 ab = [-a, -b; c, d]; |
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38 bb = [eye (n), zeros (n, m); zeros (p, n), zeros (p, m)]; |
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39 [ab,bb] = balance (ab, bb); |
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40 zr = -qzval (ab, bb); |
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41 else |
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42 error ("tzero: a, b, c, d not compatible. exiting"); |
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43 endif |
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44 |
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45 endfunction |
