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_CSROOT(3F)							   _CSROOT(3F)

NAME    [Toc]    [Back]

     CSROOT, SCSROOT  -	 EISPACK auxiliary routine.

SYNOPSYS    [Toc]    [Back]

	  subroutine  csroot(xr, xi, yr, yi)
	  double precision xr, xi, yr, yi

	  subroutine scsroot(xr, xi, yr, yi)
	  real		   xr, xi, yr, yI

DESCRIPTION    [Toc]    [Back]

     (yr,yi) = complex sqrt(xr,xi) Branch chosen so that yr .ge. 0.0 and
     sign(yi) .eq. sign(xi).


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