GAUSS-LAGUERRE AND GAUSS-HERMITE QUADRATURE ON 64, 96 AND 128 NODES
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1 GAUSS-LAGUERRE AND GAUSS-HERMITE QUADRATURE ON 64, 96 AND 128 NODES RICHARD J. MATHAR Abstract. The manuscript provides tables of abscissae and weights for Gauss- Laguerre integration on 64, 96 and 128 nodes, and abscissae and weights for Gauss-Hermite integration on 96 and 128 nodes. 1. Gauss-Laguerre We tabulate abscissae x i and weights w i for Gauss-Laguerre integration of the form n (1.1) f(x)e x dx w i f(x i ). 0 The objective is to extend the tables provided for up to n = 15 in the Handbook [1, Tabl 25.9], up to 32 points by Krylov [2] and for n = 50 in my thesis [3] to higher numbers of nodes. The abscissae are the zeros of Laguerre Polynomials, which are [1, ] (1.2) L n (x) = L (0) n (x) = n i=0 i=1 ( ) n 1 i i! ( x)i. The weights are related to the derivatives at these nodes [4], (1.3) w i = 1 x i [L n (x i ) ] 2. Shao, Chen and Frank provide the Newton iteration to converge on the roots x i of generalized Laguerre Polynomials L (α) n (x) [5]: (1.4) x i x i f(x i) f (x i ) [ and the terminating continued fraction (1.5) L (α) n (x) = x (x) n L (α) n ( 1 α + 1 x i ) ] f(xi ) f (x i ) (n + α)n (n 1 + α)(n 1) (n 2 + α)(n 2) 2n + α 1 x 2n + α 3 x 2n + α 5 x (1 + α) 1 + α x. Date: March 3, Mathematics Subject Classification. Primary 41A55, 65A05; Secondary 65D30. Key words and phrases. Gaussian Integration, Tables, Laguerre Polynomials. 1
2 2 RICHARD J. MATHAR 2. Gauss-Hermite We also tabulate abscissae x i and weights w i for Gauss-Hermite integration of the form n (2.1) f(x)e x2 dx w i f(x i ). The objective is to extend the tables provided for up to n = 20 by Krylov and in the Handbook [1, Table 25.9][2], and up to n = 64 by Shao, Chen and Frank [5]. The abscissae are the zeros of Hermite Polynomials, which are [1, ] n/2 ( ) i (2.2) H n (x) = n! i!(n 2i)! (2x)n 2i. The weights are related to the derivatives at these nodes [1, ], (2.3) w i = 2n 1 n! π [nh n 1 (x i )] 2 = 2n+1 n! π [H n(x i )] 2. The first order Newton iteration to stabilize the roots x i is (2.4) x i x i f(x i) f (x i ), i=0 i=1 and the supporting terminating continued fraction [6] is (2.5) H n (x) H n(x) = 1 2n H n (x) H n 1 (x) = 1 2n [2x 2(n 1) 2x 3. Results 2(n 2) 2x 2 2x ]. First the x i and then the associated w i are shown for the Laguerre polynomials. For Hermite polynomials, the duplicates with the opposite sign are not reproduced. The originating Maple program is shown in the appendix. Laguerre n= e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e-06
3 GAUSS QUADRATURE ON 64, 96 AND 128 NODES e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e-88
4 4 RICHARD J. MATHAR e e e e-101 Laguerre n= e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e-19
5 GAUSS QUADRATURE ON 64, 96 AND 128 NODES e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e-101
6 6 RICHARD J. MATHAR e e e e e e e e e e e e e e e e e e e e e e-155 Laguerre n= e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e-09
7 GAUSS QUADRATURE ON 64, 96 AND 128 NODES e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e-52
8 8 RICHARD J. MATHAR e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e-161
9 GAUSS QUADRATURE ON 64, 96 AND 128 NODES e e e e e e e e e e e e e e e e-210 Hermite n= e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e-31
10 10 RICHARD J. MATHAR e e e e e e e e e e e e e e e e e e e e e e e e e e-75 Hermite n= e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e-16
11 GAUSS QUADRATURE ON 64, 96 AND 128 NODES e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e-102 References 1. Milton Abramowitz and Irene A. Stegun (eds.), Handbook of mathematical functions, 9th ed., Dover Publications, New York, MR (29 #4914) 2. V. I. Krylov, Approximate calculation of integrals, Dover Publications, Mineola, New York, Richard J. Mathar, Untersuchungen zur Dynamik des optischen Stark Effektes in Halbleitern, Master s thesis, Rheinisch Westf. Techn. Hochschule Aachen, Philip Rabinowitz and George Weiss, Tables of abscissas and weights for numerical evaluation of integrals of the form 0 e x x n f(x)dx, Math. Comp. 13 (1959), MR
12 12 RICHARD J. MATHAR 5. T. S. Shao, T. C. Chen, and R. M. Frank, Tables of zeros and Gaussian weights of certain associated Laguerre polynomials and the related generalized Hermite polynomials, Math. Comp. 18 (1964), no. 88, MR (29 #3674) 6. E. T. Whittaker, On the continued fractions which represent the functions of hermite and other functions defined by differential equations, Proc. Edinb. Math. Soc. 32 (1913), interface(quiet=true): with(orthopoly) : Digits := 120 : Appendix A. Maple Source Code # Return the ratio L_n(x)/L_n (x) of # the Laguerre Polynomial of index n (log derivative) at abscissa x. # Parameter x: the abscissa value # Parameter n: Order of the Laguerre Polynomial. # Return: L_n(x)/L_n (x). ShaoChenFrank := proc(x,n) local itr,lnfrac ; lnfrac := 0 ; for itr from n-1 to 0 by -1 do lnfrac := (n-itr)^2/(2*n-2*itr-1-x-lnfrac) ; lnfrac := x/(n-lnfrac) ; return lnfrac ; end proc: # Return the ratio H_n(x)/H_n (x) of # the Hermite Polynomial of index n (log derivative) at abscissa x. # Parameter x: the abscissa value # Parameter n: Order of the Hermite Polynomial. # Return: H_n(x)/H_n (x). Hcfrac := proc(x,n) local itr,lnfrac ; lnfrac := 1/x ; for itr from 2 to n-1 do lnfrac := 2*itr/(2*x-lnfrac) ; lnfrac := (2*x-lnfrac)/(2*n) ; return lnfrac ; end proc: # Run 3 steps of Newton iterations to refine the estimate of # a root of L_n(x). # Parameter x: the estimate of the root. # Parameter n: Order of the Laguerre Polynomial. # Return: An improved estimate of the root. lagroot := proc(x,n) local l,xref,ffprime ; xref := x ; for l from 1 to 3 do ffprime := ShaoChenFrank(xref,n) ; xref := xref-ffprime*(1+ffprime*(1-1/xref)/2.0) ;
13 GAUSS QUADRATURE ON 64, 96 AND 128 NODES 13 return xref ; end proc: # Run 3 steps of Newton iterations to refine the estimate of # a root of H_n(x). # Parameter x: the estimate of the root. # Parameter n: Order of the Hermite Polynomial. # Return: An improved estimate of the root. herroot := proc(x,n) local l,xref,ffprime ; xref := x ; for l from 1 to 3 do ffprime := Hcfrac(xref,n) ; xref := xref-ffprime ; return xref ; end proc: # Print the abscissa and weights for Gauss-Laguerre Quadrature on n nodes. # Parameter n: The number of nodes. Also the order of the Laguerre Polynomial. laggaussian := proc(n) local lag,lagprime,ktau,i,xi,wi ; # Construct the Laguerre Polynomial L_n(x) lag := L(n,x) : lag := evalf(lag) : # Construct the first derivative of L_n(x) lagprime := diff(lag,x) ; # An upper estimate of the largest root of L_n(x). # See Abramowitz and Stegun ktau := evalf(n+1/2) ; # Find all roots of L_n(x) lag := fsolve(lag,x,0..2*ktau+sqrt(4*ktau^2+0.25),fulldigits,complex) ; i := 1 ; printf("laguerre n=%d\n",n) ; for xi in lag do xi := lagroot(re(xi),n) ; wi := 1/xi/(eval(lagprime,x=xi))^2 ; printf("%.30e %.30e\n",xi,wi) ; if i mod 5 = 0 then printf("\n") ; end if; i := i+1 ; printf("\n") ; return ; end proc: # Print the abscissa and weights for Gauss-Hermite Quadrature on n nodes. # Parameter n: The number of nodes. Also the order of the Hermite Polynomial. hermgaussian := proc(n) local lag,lagprime,ktau,i,xi,wi ; # Construct the Hermite Polynomial H_n(x)
14 14 RICHARD J. MATHAR lag := H(n,x) : lag := evalf(lag) : # Construct the first derivative of H_n(x) lagprime := diff(lag,x) ; # Find all roots of H_n(x) lag := fsolve(lag,x,0..infinity,fulldigits,complex) ; i := 1 ; printf("hermite n=%d\n",n) ; for xi in lag do if xi >0 then xi := herroot(re(xi),n) ; end if; wi := 2^(n+1)*n!*sqrt(Pi)/(eval(lagprime,x=xi))^2 ; printf("%.30e %.30e\n",xi,wi) ; if i mod 5 = 0 then printf("\n") ; end if; i := i+1 ; printf("\n") ; return ; end proc: for n in [64, 96, 128] do laggaussian(n) ; for n in [96, 128] do hermgaussian(n) ; URL: Hoeschstr. 7, Kreuzau, Germany
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