DOUBLE PRECISION FUNCTION sla_DRANGE (ANGLE) *+ * - - - - - - - * D R A N G E * - - - - - - - * * Normalize angle into range +/- pi (double precision) * * Given: * ANGLE dp the angle in radians * * The result (double precision) is ANGLE expressed in the range +/- pi. * * P.T.Wallace Starlink 23 November 1995 * * Copyright (C) 1995 Rutherford Appleton Laboratory * * License: * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program (see SLA_CONDITIONS); if not, write to the * Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307 USA * *- IMPLICIT NONE DOUBLE PRECISION ANGLE DOUBLE PRECISION DPI,D2PI PARAMETER (DPI=3.141592653589793238462643D0) PARAMETER (D2PI=6.283185307179586476925287D0) sla_DRANGE=MOD(ANGLE,D2PI) IF (ABS(sla_DRANGE).GE.DPI) : sla_DRANGE=sla_DRANGE-SIGN(D2PI,ANGLE) END