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com2str.m
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1999-03-05
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# Copyright (C) 1998 A. Scottedward Hodel
#
# This file is part of Octave.
#
# Octave is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any
# later version.
#
# Octave is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License
# along with Octave; see the file COPYING. If not, write to the Free
# Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
function retval = com2str(zz,flg)
# usage retval = com2str(zz{,flg})
#
# convert complex number to a string
# zz: complex number
# flg: format flag
# 0 (default): -1, 0, 1, 1i, 1 + 0.5i
# 1 (for use with zpout): -1, 0, + 1, + 1i, + 1 + 0.5i
#
if (nargin < 1 | nargin > 2)
usage("com2str(zz{,flg})");
endif
if(nargin == 1)
flg = 0;
endif
if( !(is_scalar(zz) & is_scalar(flg) ) )
error("com2str: arguments must be a scalar.");
endif
if(flg != 0 & flg != 1)
error(["Illegal flg value: ",num2str(flg)]);
endif
sgns = "+-";
rz = real(zz);
iz = imag(zz);
az = abs(zz);
if(iz == 0)
# strictly a real number
switch(flg)
case(0)
retval = num2str(rz);
case(1)
retval = [ sgns(1+(rz< 0))," ", num2str(abs(rz))];
endswitch
elseif(rz == 0)
# strictly an imaginary number
switch(flg)
case(0)
retval = num2str(iz);
case(1)
retval = [ sgns(1+(iz< 0))," ", num2str(abs(iz)),"i"];
endswitch
else
# complex number
# strictly an imaginary number
switch(flg)
case(0)
retval = [num2str(rz)," ",com2str(i*iz,1)];
case(1)
retval = [ sgns(1+(rz< 0))," ", num2str(abs(rz))," ",com2str(i*iz,1)];
endswitch
endif
endfunction