Question

Which matrix do we use to calculate principal components in PCA? $X^T X$ or covariance matrix of $X$?

score 70 · Answer 1 · 2020-04-01 12:22:34

70

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Which matrix do we use to calculate principal components in PCA? $X^T X$ or covariance matrix of $X$?

Published on 01 Apr 2020 - 12:22

score 21 · Answer 2 · 2020-04-01 17:30:39

21

Views

How can I visualize the multivariable function z = f(x(t), y(t)) in 4 dimensions?

Published on 01 Apr 2020 - 17:30

score 1.2k · Answer 3 · 2020-04-03 14:06:14

1.2k

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A visual proof:A projection $T$ is orthogonal if $||Tx||\leq ||x||$, $x\in V$.

Published on 03 Apr 2020 - 14:06

score 194 · Answer 4 · 2020-04-10 17:43:53

194

Views

"Visual" Real analysis introductory text

Published on 10 Apr 2020 - 17:43

score 79 · Answer 5 · 2026-03-25 18:53:50

79

Views

Write down what metric this transformation preserves based on animation

Published on 25 Mar 2026 - 18:53

score 267 · Answer 6 · 2020-04-16 15:44:10

267

Views

Geometrical intuition for the action of symmetry group of a cube.

Published on 16 Apr 2020 - 15:44

score 108 · Answer 7 · 2020-04-21 18:00:03

108

Views

Visualization of the proof in Lee's Smooth Manifolds book that every open cover has a regular refinement

Published on 21 Apr 2020 - 18:00

score 146 · Answer 8 · 2020-04-22 02:55:26

146

Views

Why does $h = v\cos\alpha$ never enter into the Mean Value Theorem Proof?

Published on 22 Apr 2020 - 2:55

score 221 · Answer 9 · 2020-04-22 03:33:32

221

Views

How can I generalize diagram proving Mean Value Theorem to Generalized MVT, without assuming any function as a straight line?

Published on 22 Apr 2020 - 3:33

score 177 · Answer 10 · 2020-04-22 09:57:12

177

Views

Visualizing split extensions and central extensions

Published on 22 Apr 2020 - 9:57

score 148 · Answer 11 · 2026-03-25 06:08:20

148

Views

minimum number of congruent rectangles

Published on 25 Mar 2026 - 6:08

score 280 · Answer 12 · 2020-05-03 12:16:27

280

Views

How can this graph of the relationships among types of commutative rings be improved?

Published on 03 May 2020 - 12:16

score 457 · Answer 13 · 2020-05-03 15:20:58

457

Views

Is there visual or intuitive explanation of equations of conic sections defined in traditional way?

Published on 03 May 2020 - 15:20

score 238 · Answer 14 · 2020-05-17 06:11:40

238

Views

Examples of problems/proofs which can be (surprisingly) represented in terms of graphs

Published on 17 May 2020 - 6:11

score 145 · Answer 15 · 2020-05-22 19:08:29

145

Views

Visualizing derivative of a matrix-valued function of a matrix variable

Published on 22 May 2020 - 19:08

List Question

Which matrix do we use to calculate principal components in PCA? $X^T X$ or covariance matrix of $X$?

How can I visualize the multivariable function z = f(x(t), y(t)) in 4 dimensions?

A visual proof:A projection $T$ is orthogonal if $||Tx||\leq ||x||$, $x\in V$.

"Visual" Real analysis introductory text

Write down what metric this transformation preserves based on animation

Geometrical intuition for the action of symmetry group of a cube.

Visualization of the proof in Lee's Smooth Manifolds book that every open cover has a regular refinement

Why does $h = v\cos\alpha$ never enter into the Mean Value Theorem Proof?

How can I generalize diagram proving Mean Value Theorem to Generalized MVT, without assuming any function as a straight line?

Visualizing split extensions and central extensions

minimum number of congruent rectangles

How can this graph of the relationships among types of commutative rings be improved?

Is there visual or intuitive explanation of equations of conic sections defined in traditional way?

Examples of problems/proofs which can be (surprisingly) represented in terms of graphs

Visualizing derivative of a matrix-valued function of a matrix variable

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