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C Library Functions  - norm_angle_rad (3)

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NAME

norm_angle_rad(3f) - [M_units:TRIGONOMETRY] Return input angle given in radians as angle between 0 and 2pi (LICENSE:PD)

CONTENTS

Synopsis
Description
Options
Results
Example
Author
License

SYNOPSIS

elemental function norm_angle_rad(ang) result(rev)

     class(*), intent(in) :: ang
     doubleprecision      :: rev

DESCRIPTION

Given an input angle specified in radians, normalize the value to fall in the range 0 to 2*pi radians.

OPTIONS

ang	Input angle (radians). May be INTEGER, REAL, or DOUBLEPRECISION

RESULTS

rev	Return input angle (radians) normalized to range 0>= REV <=2*pi radians

EXAMPLE

Sample program:

   program demo_norm_angle_rad
   use M_units, only : norm_angle_rad
   implicit none
   real,parameter :: PI=4*atan(1.0)
   real           :: val
   integer        :: i
   do i=-2,2
      val=i*2*pi;   write(*,*)val,norm_angle_rad(val)
      val=i*pi;     write(*,*)val,norm_angle_rad(val)
      write(*,*)
   enddo
   write(*,*)norm_angle_rad([-PI/8.0,-PI/4.0,-PI/2.0,-PI,-0.0,PI/8.0,PI/4.0,PI/2.0,PI,0.0])
   end program demo_norm_angle_rad

Results:

AUTHOR

John S. Urban

LICENSE

Public Domain

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Nemo Release 3.1

norm_angle_rad (3)

February 23, 2025

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