[icamaxresult,n,cx,incx]=icamax(n,cx,incx);

function [icamaxresult,n,cx,incx]=icamax(n,cx,incx);
icamaxresult=[];
persistent i ix smax xmag zdum ; 

;
%***BEGIN PROLOGUE  ICAMAX
%***PURPOSE  Find the smallest index of the component of a complex
%            vector having the maximum sum of magnitudes of real
%            and imaginary parts.
%***LIBRARY   SLATEC (BLAS)
%***CATEGORY  D1A2
%***TYPE      COMPLEX (ISAMAX-S, IDAMAX-D, ICAMAX-C)
%***KEYWORDS  BLAS, LINEAR ALGEBRA, MAXIMUM COMPONENT, VECTOR
%***AUTHOR  Lawson, C. L., (JPL)
%           Hanson, R. J., (SNLA)
%           Kincaid, D. R., (U. of Texas)
%           Krogh, F. T., (JPL)
%***DESCRIPTION
%
%                B L A S  Subprogram
%    Description of Parameters
%
%     --Input--
%        N  number of elements in input vector(s)
%       CX  complex vector with N elements
%     INCX  storage spacing between elements of CX
%
%     --Output--
%   ICAMAX  smallest index (zero if N .LE. 0)
%
%     Returns the smallest index of the component of CX having the
%     largest sum of magnitudes of real and imaginary parts.
%     ICAMAX = first I, I = 1 to N, to maximize
%     ABS(REAL(CX(IX+(I-1)*INCX))) + ABS(IMAG(CX(IX+(I-1)*INCX))),
%     where IX = 1 if INCX .GE. 0, else IX = 1+(1-N)*INCX.
%
%***REFERENCES  C. L. Lawson, R. J. Hanson, D. R. Kincaid and F. T.
%                 Krogh, Basic linear algebra subprograms for Fortran
%                 usage, Algorithm No. 539, Transactions on Mathematical
%                 Software 5, 3 (September 1979), pp. 308-323.
%***ROUTINES CALLED  (NONE)
%***REVISION HISTORY  (YYMMDD)
%   791001  DATE WRITTEN
%   861211  REVISION DATE from Version 3.2
%   891214  Prologue converted to Version 4.0 format.  (BAB)
%   900821  Modified to correct problem with a negative increment.
%           (WRB)
%   920501  Reformatted the REFERENCES section.  (WRB)
%***end PROLOGUE  ICAMAX
cx_shape=size(cx);cx=reshape(cx,1,[]);
if isempty(smax), smax=0; end;
if isempty(xmag), xmag=0; end;
if isempty(i), i=0; end;
if isempty(ix), ix=0; end;
if isempty(zdum), zdum=0; end;
% cabs1= @(zdum)  abs(real(zdum)) + abs(aimag(zdum));real :: cabs1;
cabs1= @(zdum)  abs(real(zdum)) + abs(imag(zdum));
%***FIRST EXECUTABLE STATEMENT  ICAMAX
icamaxresult = 0;
if( n<=0 )
cx_shape=zeros(cx_shape);cx_shape(:)=cx(1:numel(cx_shape));cx=cx_shape;
csnil=dbstack(1); csnil=csnil(1).name(1)~='@';
if csnil&&~isempty(inputname(1)), assignin('caller','FUntemp',n); evalin('caller',[inputname(1),'=FUntemp;']); end
if csnil&&~isempty(inputname(3)), assignin('caller','FUntemp',incx); evalin('caller',[inputname(3),'=FUntemp;']); end
if csnil&&~isempty(inputname(2)), assignin('caller','FUntemp',cx); evalin('caller',[inputname(2),'=FUntemp;']); end
return;
end;
icamaxresult = 1;
if( n==1 )
cx_shape=zeros(cx_shape);cx_shape(:)=cx(1:numel(cx_shape));cx=cx_shape;
csnil=dbstack(1); csnil=csnil(1).name(1)~='@';
if csnil&&~isempty(inputname(1)), assignin('caller','FUntemp',n); evalin('caller',[inputname(1),'=FUntemp;']); end
if csnil&&~isempty(inputname(3)), assignin('caller','FUntemp',incx); evalin('caller',[inputname(3),'=FUntemp;']); end
if csnil&&~isempty(inputname(2)), assignin('caller','FUntemp',cx); evalin('caller',[inputname(2),'=FUntemp;']); end
return;
end;
%
if( incx==1 )
%
%     Code for increment equal to 1.
%
cabs1= @(zdum)  abs(real(zdum)) + abs(imag(zdum));
smax = cabs1(cx(1));
for i = 2 : n;
cabs1= @(zdum)  abs(real(zdum)) + abs(imag(zdum));
xmag = cabs1(cx(i));
if( xmag>smax )
icamaxresult = i;
smax = xmag;
end;
end; i = fix(n+1);
else;
%
%     Code for increment not equal to 1.
%
ix = 1;
if( incx<0 )
ix =fix((-n+1).*incx + 1);
end;
cabs1= @(zdum)  abs(real(zdum)) + abs(imag(zdum));
smax = cabs1(cx(ix));
ix = fix(ix + incx);
for i = 2 : n;
cabs1= @(zdum)  abs(real(zdum)) + abs(imag(zdum));
xmag = cabs1(cx(ix));
if( xmag>smax )
icamaxresult = i;
smax = xmag;
end;
ix = fix(ix + incx);
end; i = fix(n+1);
cx_shape=zeros(cx_shape);cx_shape(:)=cx(1:numel(cx_shape));cx=cx_shape;
csnil=dbstack(1); csnil=csnil(1).name(1)~='@';
if csnil&&~isempty(inputname(1)), assignin('caller','FUntemp',n); evalin('caller',[inputname(1),'=FUntemp;']); end
if csnil&&~isempty(inputname(3)), assignin('caller','FUntemp',incx); evalin('caller',[inputname(3),'=FUntemp;']); end
if csnil&&~isempty(inputname(2)), assignin('caller','FUntemp',cx); evalin('caller',[inputname(2),'=FUntemp;']); end
return;
end;
cx_shape=zeros(cx_shape);cx_shape(:)=cx(1:numel(cx_shape));cx=cx_shape;
csnil=dbstack(1); csnil=csnil(1).name(1)~='@';
if csnil&&~isempty(inputname(1)), assignin('caller','FUntemp',n); evalin('caller',[inputname(1),'=FUntemp;']); end
if csnil&&~isempty(inputname(3)), assignin('caller','FUntemp',incx); evalin('caller',[inputname(3),'=FUntemp;']); end
if csnil&&~isempty(inputname(2)), assignin('caller','FUntemp',cx); evalin('caller',[inputname(2),'=FUntemp;']); end
end
%DECK ICOPY