01000		FUNCTION ORTHP(IND,ZARG,NARG)
01010	C	EVALUATION OF ONE OF FOUR TYPES OF
01011	C	ORTHOGONAL POLYNOMIALS
01020		DIMENSION A(3)
01030	    1	Z = ZARG
01040		NPL1 = NARG + 1
01050	  101	DO 191 J1 = 1,NPL1
01060		IF(J1-2)111,111,161
01070	  111	GO TO (121,141),J1
01080	  121	A(1) = 1.
01090		GO TO 191
01100	  141	A(2) = A(1)
01110		GO TO (151,152,153,151),IND
01120	  151	A(1)=Z
01130		GO TO 191
01140	  152	A(1) = 1. - Z
01150		GO TO 191
01160	  153	A(1)=Z+Z
01170		GO TO 191
01180	  161	A(3)=A(2)
01190		A(2)=A(1)
01200		AN=J1-2
01210		GO TO (181,182,183,184),IND
01220	C	LEGENDRE POLYNOMIAL
01230	  181	A(1)=((2.*AN+1.)*Z*A(2)-AN*A(3))/(AN+1.)
01240		GO TO 191
01250	C	LAGUERRE POLYNOMIAL
01260	  182	A(1)=((1.+2.*AN-Z)*A(2)-AN*A(3))/(AN+1.)
01270		GO TO 191
01280	C	HERMITE POLYNOMIAL
01290	  183	A(1)=2.*(Z*A(2)-AN*A(3))
01300		GO TO 191
01310	C	CHEBYCHEV POLYNOMIAL
01320	  184	A(1)=2.*Z*A(2)-A(3)
01330	  191	CONTINUE
01340		ORTHP = A(1)
01350		RETURN
01360		END

