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1 # Copyright (C) 1996,1998 A. Scottedward Hodel |
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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, 675 Mass Ave, Cambridge, MA 02139, USA. |
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18 |
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19 function outsys = zp2sys (zer,pol,k,tsam,inname,outname) |
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20 # sys = zp2sys (zer,pol,k{,tsam,inname,outname}) |
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21 # Create system data structure from zero-pole data |
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22 # inputs: |
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23 # zer: vector of system zeros |
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24 # pol: vector of system poles |
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25 # k: scalar leading coefficient |
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26 # tsam: sampling period. default: 0 (continuous system) |
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27 # inname, outname: input/output signal names (strings) |
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28 # outputs: sys: system data structure |
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29 |
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30 # Modified by John Ingram July 20, 1996 |
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31 |
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32 save_val = implicit_str_to_num_ok; # save for restoring later |
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33 implicit_str_to_num_ok = 1; |
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34 |
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35 # Test for the correct number of input arguments |
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36 if ((nargin < 3) || (nargin > 6)) |
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37 usage("outsys = zp2sys(zer,pol,k[,tsam,inname,outname])"); |
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38 endif |
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39 |
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40 # check input format |
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41 if( ! (is_vector(zer) | isempty(zer) ) ) |
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42 error("zer must be a vector or empty"); |
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43 endif |
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44 zer = reshape(zer,1,length(zer)); # make it a row vector |
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45 |
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46 if( ! (is_vector(pol) | isempty(pol))) |
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47 error("pol must be a vector"); |
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48 endif |
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49 pol = reshape(pol,1,length(pol)); |
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50 |
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51 if (! is_scalar(k)) |
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52 error('k must be a scalar'); |
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53 endif |
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54 |
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55 # Test proper numbers of poles and zeros. The number of poles must be |
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56 # greater than or equal to the number of zeros. |
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57 if (length(zer) > length(pol)) |
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58 error(["number of poles (", num2str(length(pol)), ... |
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59 ") < number of zeros (", num2str(length(zer)),")"]); |
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60 endif |
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61 |
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62 # Set the system transfer function |
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63 outsys.zer = zer; |
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64 outsys.pol = pol; |
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65 outsys.k = k; |
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66 |
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67 # Set the system vector: active = 1, updated = [0 1 0]; |
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68 outsys.sys = [1, 0, 1, 0]; |
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69 |
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70 # Set defaults |
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71 outsys.tsam = 0; |
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72 outsys.n = length(pol); |
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73 outsys.nz = 0; |
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74 outsys.yd = 0; # assume (for now) continuous time outputs |
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75 |
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76 # Set the type of system |
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77 if (nargin > 3) |
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78 if( !is_scalar(tsam) ) |
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79 error("tsam must be a nonnegative scalar"); |
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80 endif |
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81 if (tsam < 0) |
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82 error("sampling time must be positve") |
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83 elseif (tsam > 0) |
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84 [outsys.n,outsys.nz] = swap(outsys.n, outsys.nz); |
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85 outsys.yd = 1; # discrete-time output |
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86 endif |
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87 |
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88 outsys.tsam = tsam; |
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89 endif |
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90 |
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91 outsys.inname = sysdefioname(1,"u"); |
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92 outsys.outname = sysdefioname(1,"y"); |
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93 outsys.stname = sysdefstname(outsys.n,outsys.nz); |
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94 |
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95 # Set name of input |
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96 if (nargin > 4) |
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97 # make sure its a string |
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98 if(!isempty(inname)) |
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99 if(!is_list(inname)) inname = list(inname); endif |
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100 if(!is_signal_list(inname)) |
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101 error("inname must be a single signal name"); |
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102 endif |
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103 outsys.inname = inname(1); |
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104 endif |
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105 endif |
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106 |
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107 # Set name of output |
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108 if (nargin > 5) |
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109 if(!isempty(outname)) |
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110 if(!is_list(outname)) outname = list(outname); endif |
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111 if(!is_signal_list(outname)) |
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112 error("outname must be a single signal name"); |
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113 endif |
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114 outsys.outname = outname(1); |
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115 endif |
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116 endif |
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117 |
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118 implicit_str_to_num_ok = save_val; |
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119 endfunction |
