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Physical interpretation of Projection matrix operations $PAP$ and $(I-P)A(I-P)$

score 466 · Answer 1 · 2026-04-12 22:12:48

466

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Physical interpretation of Projection matrix operations $PAP$ and $(I-P)A(I-P)$

Published on 12 Apr 2026 - 22:12

score 117 · Answer 2 · 2026-04-14 13:07:38

117

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score 1.9k · Answer 3 · 2026-04-14 02:26:47

1.9k

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score 8.2k · Answer 4 · 2026-04-08 20:16:12

8.2k

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score 2k · Answer 5 · 2026-04-15 00:26:43

2k

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Extracting vector containing the elements of the main diagonal of a matrix

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score 651 · Answer 6 · 2026-04-15 19:42:32

651

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score 286 · Answer 7 · 2026-04-15 18:31:45

286

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Published on 15 Apr 2026 - 18:31

score 1k · Answer 8 · 2026-04-16 19:13:15

1k

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Finding the derivative of the vector function $ \mathbf{r}(t) = \langle t \sin(t),t^{2},t \cos(2t) \rangle $.

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score 122 · Answer 9 · 2026-04-12 12:35:56

122

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score 3.3k · Answer 10 · 2026-04-13 03:00:20

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217

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score 8.1k · Answer 13 · 2026-04-08 23:58:43

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score 38.9k · Answer 14 · 2026-05-03 19:24:07

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score 43 · Answer 15 · 2026-04-17 17:46:27

43

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Published on 17 Apr 2026 - 17:46

List Question

Physical interpretation of Projection matrix operations $PAP$ and $(I-P)A(I-P)$

define vector by magnitude in matlab

Two mutually perpendicular vectors

How can a function have multiple outputs?

Extracting vector containing the elements of the main diagonal of a matrix

expressing the magnitude after the distributive law of vector.

How do you add two zero vector ? Is there any meaning in it ? $\vec{0}+\vec{0}$ =?

Finding the derivative of the vector function $ \mathbf{r}(t) = \langle t \sin(t),t^{2},t \cos(2t) \rangle $.

Angle of intersection between vectors intersecting at origin, use of r(0)

How to find the intersection of a parametric line and a sphere

Cross product (high school level)

Equation of a plane, given two points and a perpendicular plane

Finding height of a triangle with vectors

How to prove polynomials with degree $n$ does not form a vector space?

Vector products

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