pkg/streamice/phi_gl_streamice.F

C $Header: /u/gcmpack/MITgcm/pkg/streamice/eta_gl_streamice.F,v 1.2 2013/06/21 18:38:45 dgoldberg Exp $
C $Name:  $

#include "CPP_OPTIONS.h"

      _RL FUNCTION PHI_GL_STREAMICE (X, W)

!      This function returns a "smoothed indicator function"
!      that is zero when x<0, 1 when x>w/2, and continuously diff.

       _RL X, W 
       _RL TMP1, PI

       IF (X.le.0.0) THEN
         PHI_GL_STREAMICE = 0.0
       ELSEIF(X.gt.0.5*W) THEN
         PHI_GL_STREAMICE = 1.0
       ELSE
         PI = 3.14159265358979323844D0
         TMP1 = COS (2*PI*X/W)
         PHI_GL_STREAMICE = 0.5 * (1-TMP1)
       ENDIF

       RETURN
       END 
1	dgoldberg	1.2	C $Header: /u/gcmpack/MITgcm/pkg/streamice/eta_gl_streamice.F,v 1.2 2013/06/21 18:38:45 dgoldberg Exp $
2			C $Name: $
3
4	dgoldberg	1.1	#include "CPP_OPTIONS.h"
5
6			_RL FUNCTION PHI_GL_STREAMICE (X, W)
7
8			! This function returns a "smoothed indicator function"
9			! that is zero when x<0, 1 when x>w/2, and continuously diff.
10
11			_RL X, W
12			_RL TMP1, PI
13
14	dgoldberg	1.2	IF (X.le.0.0) THEN
15	dgoldberg	1.1	PHI_GL_STREAMICE = 0.0
16	dgoldberg	1.2	ELSEIF(X.gt.0.5*W) THEN
17	dgoldberg	1.1	PHI_GL_STREAMICE = 1.0
18			ELSE
19			PI = 3.14159265358979323844D0
20			TMP1 = COS (2PIX/W)
21			PHI_GL_STREAMICE = 0.5 * (1-TMP1)
22			ENDIF
23
24			RETURN
25	dgoldberg	1.2	END