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51 lines
1.4 KiB
Fortran
51 lines
1.4 KiB
Fortran
REAL FUNCTION sla_RANGE (ANGLE)
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*+
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* - - - - - -
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* R A N G E
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* - - - - - -
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*
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* Normalize angle into range +/- pi (single precision)
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*
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* Given:
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* ANGLE dp the angle in radians
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*
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* The result is ANGLE expressed in the +/- pi (single
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* precision).
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*
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* P.T.Wallace Starlink 23 November 1995
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*
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* Copyright (C) 1995 Rutherford Appleton Laboratory
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*
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* License:
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see SLA_CONDITIONS); if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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*-
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IMPLICIT NONE
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REAL ANGLE
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REAL API,A2PI
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PARAMETER (API=3.141592653589793238462643)
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PARAMETER (A2PI=6.283185307179586476925287)
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sla_RANGE=MOD(ANGLE,A2PI)
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IF (ABS(sla_RANGE).GE.API)
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: sla_RANGE=sla_RANGE-SIGN(A2PI,ANGLE)
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END
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