text: /*
  ** libproj -- library of cartographic projections
  **
  ** Copyright (c) 2003, 2006   Gerald I. Evenden
  */
  static const char
  LIBPROJ_ID[] = "$Id$";
  /*
  ** Permission is hereby granted, free of charge, to any person obtaining
  ** a copy of this software and associated documentation files (the
  ** "Software"), to deal in the Software without restriction, including
  ** without limitation the rights to use, copy, modify, merge, publish,
  ** distribute, sublicense, and/or sell copies of the Software, and to
  ** permit persons to whom the Software is furnished to do so, subject to
  ** the following conditions:
  **
  ** The above copyright notice and this permission notice shall be
  ** included in all copies or substantial portions of the Software.
  **
  ** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  ** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  ** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  ** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
  ** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  ** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  ** SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  */
  /*
  ** Evaluate complex polynomial
  */
  #include <lib_proj.h>
  /* note: coefficients are always from C_1 to C_n
  **  i.e. C_0 == (0., 0)
  **  n should always be >= 1 though no checks are made
  */
    PROJ_COMPLEX
  proj_zpoly1(PROJ_COMPLEX z, PROJ_COMPLEX *C, int n) {
    PROJ_COMPLEX a;
    double t;
  
    a = *(C += n);
    while (n-- > 0) {
      a.r = (--C)->r + z.r * (t = a.r) - z.i * a.i;
      a.i = C->i + z.r * a.i + z.i * t;
    }
    a.r = z.r * (t = a.r) - z.i * a.i;
    a.i = z.r * a.i + z.i * t;
    return a;
  }
  /* evaluate complex polynomial and derivative */
    PROJ_COMPLEX
  proj_zpolyd1(PROJ_COMPLEX z, PROJ_COMPLEX *C, int n, PROJ_COMPLEX *der) {
    PROJ_COMPLEX a, b;
    double t;
    int first = 1;
  
    b = a = *(C += n);
    while (n-- > 0) {
      if (first)
        first = 0;
      else {
        b.r = a.r + z.r * (t = b.r) - z.i * b.i;
        b.i = a.i + z.r * b.i + z.i * t;
      }
      a.r = (--C)->r + z.r * (t = a.r) - z.i * a.i;
      a.i = C->i + z.r * a.i + z.i * t;
    }
    b.r = a.r + z.r * (t = b.r) - z.i * b.i;
    b.i = a.i + z.r * b.i + z.i * t;
    a.r = z.r * (t = a.r) - z.i * a.i;
    a.i = z.r * a.i + z.i * t;
    *der = b;
    return a;
  }
  /*
  ** $Log: proj_zpoly1.c,v $
  ** Revision 3.2  2008/06/26 15:08:38  gie
  ** alter initialization sequence
  **
  ** Revision 3.1  2006/01/11 01:38:18  gie
  ** Initial
  **
  */
  