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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include "surfitdef.h"
+
+# ISFREE -- Procedure to free the surface descriptor
+
+procedure isfree (sf)
+
+pointer sf # pointer to the surface descriptor
+errchk mfree
+
+begin
+ # free arrays in memory
+
+ # first the basis functions
+ if (SF_XBASIS(sf) != NULL)
+ call mfree (SF_XBASIS(sf), MEM_TYPE)
+ if (SF_XLEFT(sf) != NULL)
+ call mfree (SF_XLEFT(sf), TY_INT)
+ if (SF_YBASIS(sf) != NULL)
+ call mfree (SF_YBASIS(sf), MEM_TYPE)
+ if (SF_YLEFT(sf) != NULL)
+ call mfree (SF_YLEFT(sf), TY_INT)
+
+ # next the x and y matrices
+ if (SF_XMATRIX(sf) != NULL)
+ call mfree (SF_XMATRIX(sf), MEM_TYPE)
+ if (SF_YMATRIX(sf) != NULL)
+ call mfree (SF_YMATRIX(sf), MEM_TYPE)
+
+ # last the coefficient matrices
+ if (SF_XCOEFF(sf) != NULL)
+ call mfree (SF_XCOEFF(sf), MEM_TYPE)
+ if (SF_COEFF(sf) != NULL)
+ call mfree (SF_COEFF(sf), MEM_TYPE)
+
+ if (SF_WZ(sf) != NULL)
+ call mfree (SF_WZ(sf), MEM_TYPE)
+ if (SF_TLEFT(sf) != NULL)
+ call mfree (SF_TLEFT(sf), TY_INT)
+
+ # free surface descriptor
+ if (sf != NULL)
+ call mfree (sf, TY_STRUCT)
+end