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1 ## Copyright (C) 1998 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 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {} com2str (@var{zz}, @var{flg}) |
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21 ## |
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22 ## convert complex number to a string |
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23 ## @strong{Inputs} |
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24 ## @table @var |
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25 ## @item zz |
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26 ## complex number |
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27 ## @item flg |
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28 ## format flag |
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29 ## 0 (default): -1, 0, 1, 1i, 1 + 0.5i |
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30 ## 1 (for use with zpout): -1, 0, + 1, + 1i, + 1 + 0.5i |
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31 ## @end table |
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32 ## @end deftypefn |
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33 |
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34 function retval = com2str (zz, flg) |
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35 |
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36 if (nargin < 1 || nargin > 2) |
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37 usage ("com2str (zz, flg)"); |
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38 endif |
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39 if (nargin == 1) |
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40 flg = 0; |
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41 endif |
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42 |
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43 if (! (is_scalar (zz) && is_scalar (flg))) |
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44 error ("com2str: arguments must be a scalar"); |
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45 endif |
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46 |
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47 if (flg != 0 && flg != 1) |
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48 error ("invalid flg value: %d", flg); |
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49 endif |
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50 |
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51 sgns = "+-"; |
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52 rz = real (zz); |
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53 iz = imag (zz); |
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54 az = abs (zz); |
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55 if (iz == 0) |
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56 ## strictly a real number |
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57 switch (flg) |
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58 case(0) |
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59 retval = num2str (rz); |
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60 case(1) |
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61 retval = [sgns(1+(rz<0)), " ", num2str(abs(rz))]; |
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62 endswitch |
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63 elseif (rz == 0) |
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64 ## strictly an imaginary number |
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65 switch (flg) |
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66 case(0) |
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67 retval = num2str (iz); |
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68 case(1) |
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69 retval = [sgns(1+(iz<0)), " ", num2str(abs(iz)), "i"]; |
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70 endswitch |
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71 else |
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72 ## complex number |
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73 ## strictly an imaginary number |
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74 switch (flg) |
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75 case(0) |
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76 retval = [num2str(rz), " ", com2str(i*iz,1)]; |
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77 case(1) |
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78 retval = [sgns(1+(rz<0)), " ", num2str(abs(rz)), " ", com2str(i*iz,1)]; |
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79 endswitch |
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80 endif |
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81 |
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82 endfunction |
