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