(b) We wish to evaluate the integral S1 exp(-x) dx using Gauss quadrature (based on Legendre polynomials). Give an estimate of the number of sampling points until the integration error reaches machine precision e x 10¬14. Justify your answer.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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(a) is answered, repost for (b)

(a)
Obtain the three-point Gauss-Hermite quadrature formula
| f(t)e-t dt = wof (to) + wif(t1) + w2f(t2).
Derive analytic expressions for the sampling points {to, t1, t2} and integration weights
{wo, w1, w2}. Use the identity So t2n exp(-t²) dt
= /T 22n+in!:
22n+1n!*
(b) We wish to evaluate the integral S, exp(-x) dx using Gauss quadrature (based on Legendre
polynomials). Give an estimate of the number of sampling points until the integration error
reaches machine precision e = 10. Justify your answer.
-14
Transcribed Image Text:(a) Obtain the three-point Gauss-Hermite quadrature formula | f(t)e-t dt = wof (to) + wif(t1) + w2f(t2). Derive analytic expressions for the sampling points {to, t1, t2} and integration weights {wo, w1, w2}. Use the identity So t2n exp(-t²) dt = /T 22n+in!: 22n+1n!* (b) We wish to evaluate the integral S, exp(-x) dx using Gauss quadrature (based on Legendre polynomials). Give an estimate of the number of sampling points until the integration error reaches machine precision e = 10. Justify your answer. -14
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