# Assignment # 6 (Makeup # 2) CSE 330 (01).

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Assignment # 6 (Makeup # 2) CSE 330 (01).
(a) (3 marks) Show that the set,
S =
{
1

5
(
2, −1, 0
)T
,
1

30
(
1, 2, −5
)T
,
1

24
(
2, 4, 2
)T
}
is orthonormal.
(b) (6 marks) Consider the values of f(x) = sin x at the points x0 = 4, x1 = 9 and x2 = −6. Consider only up to 3
decimal places after rounding. Now, evaluate the best fit straight line using the Discrete Square Approximation
for the given function.
2. Consider a set of four data points given below:
f(0) = 3, f(4) = −2, f(−1) = 2, and f(1) = 1 .
Use the above data values to find the best fit polynomial of degree 2 by using the QR-decomposition method by
answering the questions below step by step.
(a) (2.5+1.5 marks) Identify the matrix A and b. Also identify the linearly independent column vectors u1, u2
and u3 from the matrix A. Explain why there are only three linearly independent vectors u1, u2 and u3.
(b) (1+2+3 marks) Using Gram-Schmidt process construct the orthonormal column matrices (or vectors) q1, q2
and q3 from the linearly independent column vectors obtained in the previous part, and then write down the
Q matrix.
(c) (3 marks) Now calculate the matrix elements of R , and write down the matrix R.
(d) (4 marks) Compute Rx and QTb.
(e) (4 marks) Let x = (a0 a1 a2)
T being the coefficients of the polynomial p2(x). Evaluate these coefficients and
write down the polynomial p2(x).
Motto: Mathematics is NOT difficult, but what is difficult is to believe that mathematics is NOT difficult.

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