Question
In: Civil Engineering
8. (a) Classify the quadric surface 4? 2 − ? + 2? 2 = 0. [4...
8. (a) Classify the quadric surface 4? 2 − ? + 2? 2 = 0. [4 points]
(b) Find the traces of the above surface in xy, xz, yz-plane respectively. [6 points]
Solutions
Ally Wells answered 6 months agoRelated Solutions
A = （1 −7 5 0 0 10 8 2 2 4 10 3 −4 8...
A =
（1 −7 5 0
0 10 8 2
2 4 10 3
−4 8 −9 6）
(1) Count the number of rows that contain negative
components.
(2) Obtain the inverse of A and count the number of columns that
contain even number of positive components.
(3) Assign column names (a,b,c,d) to the columns of A.
(4) Transform the matrix A into a vector object a by stacking
rows.
(5) Replace the diagonal components of A with (0,0,2,3). Hint:...
A= 1 2 4 0 1 -2 -1 0 1 2 0 3 8 1 4...
A=
1
2
4
0
1
-2
-1
0
1
2
0
3
8
1
4
. Let W denote the row space for A.
(a) Find an orthonormal basis for W and for W⊥.
(b) Compute projW⊥(1 1 1 1 1 ).
Suppose that ? is the intersection of the plane ?+?+3?=4 and the surface ?^2−?^2=?^2−8 . Note...
Suppose that ? is the intersection of the plane ?+?+3?=4 and the
surface ?^2−?^2=?^2−8 . Note that this intersection contains the
point (3,4,−1) . Verify the assumptions of the implicit function
theorem at this point; then if ?(?)=(?,?) φ ( x ) = ( y , z ) be
the function from ℝ→ℝ2 R → R 2 verifying the conclusion of the
implicit function theorem, compute ??(3) J φ ( 3 ) using the
theorem. Verify your conclusion by explicitly...
DATA 3 8 2 15 2 2 0 0 4 5 2 7 0 1 5...
DATA
3
8
2
15
2
2
0
0
4
5
2
7
0
1
5
3
0
2
5
4
1
6
9
5
3
1
2
10
6
1
1
2
1
19
6
6
6
7
0
4
1
1
1
0
1
9
2
2
2
1
16
10
10
5
2
3
1
4
4
4
3
6
2
8
5
2
7
1
6
4
0
3
1
1
1
Background:
A group of...
x (Bins) frequency 0 0 1 0 2 0 3 2 4 5 5 8 6...
x (Bins)
frequency
0
0
1
0
2
0
3
2
4
5
5
8
6
13
7
33
8
42
9
66
10
77
11
105
12
103
13
110
14
105
15
84
16
70
17
51
18
40
19
27
20
27
21
15
22
5
23
7
24
2
25
2
26
1
27
0
28
0
29
0
30
0
(7) On the Histogram worksheet, calculate all
frequencies of the distribution using the table shown....
given the sequences x1 = [2, 6, -4, 1] x2 = [8, 0, 2, 0, -9,...
given the sequences
x1 = [2, 6, -4, 1]
x2 = [8, 0, 2, 0, -9, 0, 1, 0]
x3 = [2, 0, -8, -8, 2]
x4 = [0, 1, 5i, 0, 6i, 0]
x5 = [9, 3, 7]
plot the
1. DFT magnitude of the computed sequences in MATLAB
2. phase responses in degrees and radians against frequency and
number of samples
3. comment on the plots
DATA 2 ID X1 X2 X3 Y A 0 2 4 9 B 1 0 8...
DATA 2
ID
X1
X2
X3
Y
A
0
2
4
9
B
1
0
8
10
C
0
1
0
5
D
1
1
0
1
E
0
0
8
10
CORRELATION MATRIX
Y
X1
X2
X3
Y
1
?
-0.304
+0.889
X1
?
1
-0.327
0
X2
-0.304
-0.327
1
-0.598
X3
+0.889
0
-0.598
1
1. What is the sum of squares regression for the full model?
(Correct answer is 58, please show me how to get...
DATA 2 ID X1 X2 X3 Y A 0 2 4 9 B 1 0 8...
DATA 2
ID
X1
X2
X3
Y
A
0
2
4
9
B
1
0
8
10
C
0
1
0
5
D
1
1
0
1
E
0
0
8
10
CORRELATION MATRIX
Y
X1
X2
X3
Y
1
?
-0.304
+0.889
X1
?
1
-0.327
0
X2
-0.304
-0.327
1
-0.598
X3
+0.889
0
-0.598
1
Comparing the zero order model and full
model
1. Did the addition of X2 and X3
significantly increase R2? (correct answer is...
Data: 7,-5, -8, 7, 9, 15, 0, 2, 13, 8, 6, -2, 4 (a) Mean= Mode=...
Data: 7,-5, -8, 7, 9, 15, 0, 2, 13, 8, 6, -2, 4 (a) Mean= Mode=
median= (b) Variance= Standard deviation= (c) Range=
IQR(Interquartilerange)= (d) Mid-Range= Mid-Hinge=
The surface z = 3x^(2) + (1/6)x^(3) - (1/8)x^(4) - 4y^(2) is intersected by the plane...
The surface z = 3x^(2) + (1/6)x^(3) - (1/8)x^(4) - 4y^(2) is
intersected by the plane 2x - y = 1. The resulting intersection is
a curve on the surface. Find a set of parametric equations for the
line tangent to this curve at the point (1,1,-23/24).
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