CompX: Mathematics of PCA - Matrices

Computational Thinking and Big Data is part of the Big Data MicroMasters program offered by The University of Adelaide and edX.

Learn the core concepts of computational thinking and how to collect, clean and consolidate large-scale datasets.

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[arjsub]

great video. thank you. Understood very well.

[bigbossfan]

Beautifully explained. just what i wanted!

[matthewbrondum]

At the end you wrote lambda 1 but you said 1, I think you meant to write what you said (1). I posit this because 1 x [1 -1] = [1 -1] = [ [ 2 1] [1 2]] x [1 -1] = [(2 x 1) + (1 x -1) and [ (1 x 1) + (2 x -1)]

[TheBjjninja]

Is he writing backwards manually or is the board or video mirrored?

[prasshanthvp]

For V2 as [1 -1] your output is [3 -1]. There is no eigenvalue except 1 which can be taken as common for two data points 3, -1. Hence V2 seems invalid or am I missing something?

[castro_hassler]

Why aren't you uploding videos anymore?