[n,ca,cx,incx]=cscal(n,ca,cx,incx);

function [n,ca,cx,incx]=cscal(n,ca,cx,incx);
%***BEGIN PROLOGUE  CSCAL
%***PURPOSE  Multiply a vector by a constant.
%***LIBRARY   SLATEC (BLAS)
%***CATEGORY  D1A6
%***TYPE      COMPLEX (SSCAL-S, DSCAL-D, CSCAL-C)
%***KEYWORDS  BLAS, LINEAR ALGEBRA, SCALE, 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)
%       CA  complex scale factor
%       CX  complex vector with N elements
%     INCX  storage spacing between elements of CX
%
%     --Output--
%       CX  complex result (unchanged if N .LE. 0)
%
%     Replace complex CX by complex CA*CX.
%     For I = 0 to N-1, replace CX(IX+I*INCX) with CA*CX(IX+I*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
%   890831  Modified array declarations.  (WRB)
%   890831  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  CSCAL
persistent i ix ; 

cx_shape=size(cx);cx=reshape(cx,1,[]);
if isempty(i), i=0; end;
if isempty(ix), ix=0; end;
%***FIRST EXECUTABLE STATEMENT  CSCAL
if( n<=0 )
cx_shape=zeros(cx_shape);cx_shape(:)=cx(1:numel(cx_shape));cx=cx_shape;
return;
end;
%
if( incx==1 )
%
%     Code for increment equal to 1.
%
for i = 1 : n;
cx(i) = ca.*cx(i);
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;
for i = 1 : n;
cx(ix) = ca.*cx(ix);
ix = fix(ix + incx);
end; i = fix(n+1);
cx_shape=zeros(cx_shape);cx_shape(:)=cx(1:numel(cx_shape));cx=cx_shape;
return;
end;
cx_shape=zeros(cx_shape);cx_shape(:)=cx(1:numel(cx_shape));cx=cx_shape;
end
%DECK CSERI