[4 Given for free: The product DTD is D"D = 2o 201 b. Find the inverse of the product DTD (D"D)* = E 3 and record it in the box.
[4 Given for free: The product DTD is D"D = 2o 201 b. Find the inverse of the product DTD (D"D)* = E 3 and record it in the box.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:Problem 2: Curve Fitting: The data points (x;, Yi) were observed (-3,3), (-1, –1), (1,3) and (3, 15).
3
Thus, the x-values and y-values are: X =
and y =
The plot shows these data points and both the best-fit line
3
15
16
and the best-fit parabola.
14
a. Record the design matrix D you would use to find the best-fit line.
12
10
8
y = Bo + B1 x
D =
4
Given for free: The product D"D is D"D =
-3
-2
-1
1
3
X-ахis
b. Find the inverse of the product D"D
-哈
(D"D)-1 =
and record it in the box.
c. Solve the normal equation ( D"D)B = D"ỷ to find the vector B =
with the best-fit parameters for the line.
Hint: D"ÿ
Parameter vector B.
It can be shown that the best-fit line gives the estimates
Yest =
3
Find the error vector: ý - yest ·
Then give the root mean square error.
RMSE =
Error vector =
Parabolic design matrix D:
Let's start over and try a parabolic fit. Record the design matrix D
ou would use to find the best-fit parabola y = Bo + B1 x + B2 x2
D =
Nice! The parabola fits perfectly, and you would find B
= 2. Using this parabola, estimate y(2) =
DDOD
DDOD
y-axis
DD DD
DDDD
DDDD
DDDD
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