[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.

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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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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
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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