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1 # Copyright (C) 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 retval = com2str(zz,flg) |
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20 # usage retval = com2str(zz{,flg}) |
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21 # |
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22 # convert complex number to a string |
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23 # zz: complex number |
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24 # flg: format flag |
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25 # 0 (default): -1, 0, 1, 1i, 1 + 0.5i |
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26 # 1 (for use with zpout): -1, 0, + 1, + 1i, + 1 + 0.5i |
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27 # |
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28 # $Revision: 1.1 $ |
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29 |
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30 if (nargin < 1 | nargin > 2) |
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31 usage("com2str(zz{,flg})"); |
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32 endif |
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33 if(nargin == 1) |
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34 flg = 0; |
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35 endif |
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36 |
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37 if( !(is_scalar(zz) & is_scalar(flg) ) ) |
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38 error("com2str: arguments must be a scalar."); |
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39 endif |
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40 |
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41 if(flg != 0 & flg != 1) |
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42 error(["Illegal flg value: ",num2str(flg)]); |
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43 endif |
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44 |
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45 sgns = "+-"; |
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46 rz = real(zz); |
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47 iz = imag(zz); |
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48 az = abs(zz); |
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49 if(iz == 0) |
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50 # strictly a real number |
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51 switch(flg) |
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52 case(0) |
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53 retval = num2str(rz); |
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54 case(1) |
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55 retval = [ sgns(1+(rz< 0))," ", num2str(abs(rz))]; |
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56 endswitch |
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57 elseif(rz == 0) |
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58 # strictly an imaginary number |
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59 switch(flg) |
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60 case(0) |
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61 retval = num2str(iz); |
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62 case(1) |
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63 retval = [ sgns(1+(iz< 0))," ", num2str(abs(iz)),"i"]; |
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64 endswitch |
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65 else |
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66 # complex number |
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67 # strictly an imaginary number |
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68 switch(flg) |
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69 case(0) |
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70 retval = [num2str(rz)," ",com2str(i*iz,1)]; |
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71 case(1) |
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72 retval = [ sgns(1+(rz< 0))," ", num2str(abs(rz))," ",com2str(i*iz,1)]; |
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73 endswitch |
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74 endif |
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75 |
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76 endfunction |
