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70
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1 function [n, m, p] = abcddim (a, b, c, d) |
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60
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2 |
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70
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3 # Usage: [n, m, p] = abcddim (a, b, c, d) |
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60
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4 # |
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5 # Check for compatibility of the dimensions of the matrices defining |
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6 # the linear system (a, b, c, d). |
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7 # |
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70
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8 # Returns n = number of system states, |
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9 # m = number of system inputs, |
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10 # p = number of system outputs. |
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60
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11 # |
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70
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12 # Returns n = m = p = -1 if the system is not compatible. |
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13 |
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78
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14 # Written by A. S. Hodel (scotte@eng.auburn.edu) August 1993. |
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60
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15 |
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16 if (nargin != 4) |
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70
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17 error ("abcddim: illegal number of arguments. need four.") |
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60
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18 endif |
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19 |
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70
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20 n = m = p = -1; |
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60
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21 |
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70
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22 [an, am] = size(a); |
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60
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23 if (an != am) |
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70
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24 fprintf (stderr, "abcddim: a is not square"); |
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60
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25 return; |
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26 endif |
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27 |
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70
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28 [bn, bm] = size(b); |
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60
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29 if (bn != am) |
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70
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30 fprintf (stderr, "abcddim: a and b are not compatible"); |
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60
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31 return; |
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32 endif |
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33 |
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70
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34 [cn, cm] = size(c); |
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60
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35 if (cm != an) |
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70
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36 fprintf (stderr, "abcddim: a and c are not compatible"); |
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60
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37 return; |
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38 endif |
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39 |
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70
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40 [dn, dm] = size(d); |
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60
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41 if (cn != dn) |
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70
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42 fprintf (stderr, "abcddim: c and d are not compatible"); |
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60
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43 return; |
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44 endif |
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45 |
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46 if (bm != dm) |
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70
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47 fprintf (stderr, "abcddim: b and d are not compatible"); |
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60
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48 return; |
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49 endif |
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50 |
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51 n = an; |
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52 m = bm; |
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53 p = cn; |
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54 |
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55 endfunction |
