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1 function zr = tzero (a, b, c, d, bal) |
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2 |
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3 # Compute the transmission zeros of a, b, c, d. |
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4 # |
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5 # bal = balancing option (see balance); default is "B". |
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6 # |
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7 # Needs to incorporate mvzero algorithm to isolate finite zeros. |
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8 |
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9 if (nargin == 4) |
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10 bal = "B"; |
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11 elseif (nargin ~= 5) |
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12 error("tzero: illegal number of arguments") |
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13 endif |
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14 |
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15 [n, m, p] = abcdchk (a, b, c, d); |
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16 |
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17 if(m != p) |
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18 |
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19 disp("warning: tzero: number of inputs,outputs differ -- squaring up") |
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20 |
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21 if (p > m) |
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22 disp (" by padding b, d with zeros") |
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23 b = [b, zeros (n, p-m)]; |
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24 d = [d, zeros (p, p-m)]; |
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25 m = p; |
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26 else |
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27 disp (" by padding c,d with zeros") |
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28 c = [c; zeros (m-p, n)]; |
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29 d = [d; zeros (m-p, m)]; |
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30 p = m; |
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31 endif |
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32 |
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33 disp ("This is a kludge. Try again with SISO system.") |
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34 |
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35 endif |
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36 |
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37 if (n != -1) |
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38 ab = [-a -b; c d]; |
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39 bb = [eye (n), zeros (n, m); zeros (p, n), zeros (p, m)]; |
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40 [ab, bb] = balance (ab, bb); |
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41 zr = qzval (ab, bb); |
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42 endif |
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43 |
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44 endfunction |
