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C @(#)mean.for 19.1 (ES0-DMD) 02/25/03 13:30:46
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C===========================================================================
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C Copyright (C) 1995 European Southern Observatory (ESO)
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C This program is free software; you can redistribute it and/or
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C modify it under the terms of the GNU General Public License as
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C published by the Free Software Foundation; either version 2 of
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C the License, or (at your option) any later version.
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C This program is distributed in the hope that it will be useful,
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C but WITHOUT ANY WARRANTY; without even the implied warranty of
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C MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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C GNU General Public License for more details.
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C You should have received a copy of the GNU General Public
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C License along with this program; if not, write to the Free
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C Software Foundation, Inc., 675 Massachusetss Ave, Cambridge,
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C Corresponding concerning ESO-MIDAS should be addressed as follows:
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C Internet e-mail: midas@eso.org
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C Postal address: European Southern Observatory
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C Data Management Division
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C Karl-Schwarzschild-Strasse 2
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C D 85748 Garching bei Muenchen
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C===========================================================================
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C+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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C subroutine MEAN version 2 810727
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C A. Kruszewski ESO - Garching
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C calculates mean value "AMEAN" and sigma "SIGMA" of random
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C variable basing on a sample presented in form of an array
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C A real*4 array data array
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C N integer*4 number of values in "A"
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C AMEAN real*4 mean of data in "A"
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C SIGMA real*4 sigma of data in "A"
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C-----------------------------------------------------------------------
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SUBROUTINE MEAN(A,N,AMEAN,SIGMA)
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C *** Calculates mean and sigma.
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C *** Checks if "SSUM" is positive.
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IF (SSUM.GT.0.00001) THEN
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SIGMA=SQRT(SSUM*(N/FLOAT(N-1)))