Initial commit

1 files changed, 98 insertions, 0 deletions

diff --git a/math/gsurfit/gs_bevalr.x b/math/gsurfit/gs_bevalr.x
new file mode 100644
index 00000000..9d22e3dc
--- /dev/null
+++ b/math/gsurfit/gs_bevalr.x
@@ -0,0 +1,98 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# GS_BPOL -- Procedure to evaluate all the non-zero polynomial functions for
+# a set of points and given order.
+
+procedure rgs_bpol (x, npts, order, k1, k2, basis)
+
+real	x[npts]		# array of data points
+int	npts		# number of points
+int	order		# order of polynomial, order = 1, constant
+real	k1, k2		# normalizing constants
+real	basis[ARB]	# basis functions
+
+int	bptr, k
+
+begin
+	bptr = 1
+	do k = 1, order {
+
+	    if (k == 1)
+	        call amovkr (1.0, basis, npts)
+	    else if (k == 2)
+		call amovr (x, basis[bptr], npts)
+	    else 
+		call amulr (basis[bptr-npts], x, basis[bptr], npts)
+		
+	    bptr = bptr + npts
+	}
+end
+
+# GS_BCHEB -- Procedure to evaluate all the non-zero Chebyshev functions for
+# a set of points and given order.
+
+procedure rgs_bcheb (x, npts, order, k1, k2, basis)
+
+real	x[npts]		# array of data points
+int	npts		# number of points
+int	order		# order of polynomial, order = 1, constant
+real	k1, k2		# normalizing constants
+real	basis[ARB]	# basis functions
+
+int	k, bptr
+
+begin
+	bptr = 1
+	do k = 1, order {
+
+	    if (k == 1)
+	        call amovkr (1.0, basis, npts)
+	    else if (k == 2)
+		call altar (x, basis[bptr], npts, k1, k2)
+	    else {
+		call amulr (basis[1+npts], basis[bptr-npts], basis[bptr],
+		    npts)
+		call amulkr (basis[bptr], 2.0, basis[bptr], npts)
+		call asubr (basis[bptr], basis[bptr-2*npts], basis[bptr], npts)
+	    }
+		
+	    bptr = bptr + npts
+	}
+end
+
+
+# GS_BLEG -- Procedure to evaluate all the non zero Legendre function
+# for a given order and set of points.
+
+procedure rgs_bleg (x, npts, order, k1, k2, basis)
+
+real	x[npts]		# number of data points
+int	npts		# number of points
+int	order		# order of polynomial, 1 is a constant
+real	k1, k2		# normalizing constants
+real	basis[ARB]	# array of basis functions
+
+int	k, bptr
+real	ri, ri1, ri2
+
+begin
+	bptr = 1
+	do k = 1, order {
+
+	    if (k == 1)
+		call amovkr (1.0, basis, npts)
+	    else if (k == 2)
+		call altar (x, basis[bptr], npts, k1, k2)
+	    else {
+		ri = k
+		ri1 = (2. * ri - 3.) / (ri - 1.)
+		ri2 = - (ri - 2.) / (ri - 1.)
+		call amulr (basis[1+npts], basis[bptr-npts], basis[bptr],
+		    npts)
+		call awsur (basis[bptr], basis[bptr-2*npts],
+			basis[bptr], npts, ri1, ri2)
+	    }
+			
+	    bptr = bptr + npts
+	}
+end