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File: [HallC] / Analyzer / UTILSUBS / g_normalize.f (download)
Revision: 1.1, Wed Feb 9 14:16:38 1994 UTC (30 years, 7 months ago) by cdaq
Branch: MAIN
CVS Tags: spring03, sep0596, sep-26-2002, sep-25-2002, sep-24-2002, sep-09-2002, sane, pionct, online07, online04, online03, oct1199, oct1194, nov2894, nov2696, mduality, may2495, may1894, mar1495, mar-24-2003, jun1794, jun1594, jun1394, jun0794, jul2895, jul0794, jan2795, jan2496, jan1896, jan1796, gep_online, gep3, fpi2, emc, e01004, dec0694, bigcal, baryon, aug1794, aug0394, aug-12-2003, apr3096, apr1594, apr0695, apr-02-2003, Initial-CVS-Release, HEAD, Extra_Shower_Tubes_on_HMS_not_SOS

Initial revision


      SUBROUTINE G_normalize(x,y,z)
*----------------------------------------------------------------------
*- 
*-   Purpose and Methods : normalizes a vector 
*- 
*-   Inputs  : x	- X coord. (conventional right handed system) 
*-             y	- Y 
*-             z	- Z 
*-   Outputs : x	- X coord. (conventional right handed system) 
*-             y	- Y 
*-             z	- Z 
*- 
*-   Created  24-MAR-1992   Kevin B. Beard 
*-   Modified for hall C 9/1/93: KBB
*     $Log: g_normalize.f,v $
*     Revision 1.1  1994/02/09 14:16:38  cdaq
*     Initial revision
*
*- 
*----------------------------------------------------------------------
      IMPLICIT NONE
      real x,y,z,r 
      logical normalizable 
      real nothing
      parameter (nothing= 1.E-25)
      real r2
*----------------------------------------------------------------------
*
	r2= x**2 + y**2 + z**2
	normalizable= r2.GT.nothing
	IF(normalizable) THEN 
	  r= SQRT(r2)
	  x= x/r
	  y= y/r
	  z= z/r
	ELSE
	  x= 0. 
	  y= 0. 
	  z= 0. 
	ENDIF 
	RETURN
	end

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