rafalab / dsbook-part-2 Goto Github PK

When I run the code in R, I get the same warnings but we'd want to suppress? or fix the issue for the pdf?

pdf: http://rafalab.dfci.harvard.edu/dsbook-part-2/ml/cross-validation.html#over-smoothing

code: https://github.com/rafalab/dsbook-part-2/blob/389d7c8a799ee8d866c8156b78c221c0ec4890e6/ml/cross-validation.qmd#L148C1-L158C4

2nd edition	1st edition

In chapter 21 - Dimension reduction you present the following for calculation of the
rotation matrix:

theta <- 2pi-45/360 #convert to radians
A <- matrix(c(cos(theta), -sin(theta), sin(theta), cos(theta)), 2, 2)

Is it correct to convert to radians since above (cos(theta), -sin(tetha), ...) ?

Ex: for a 45 degree... cos(45) = .70710677812 while cos(theta=2pi-45/360) = .9942295176 .
Maybe I miss something in my geometry understanding...

Kind regards,

Denis

http://rafalab.dfci.harvard.edu/dsbook-part-2/prob/discrete-probability.html#monte-carlo-example

(hands[1] %in% aces & hands[2] %in% facecard) | 
  (hands[2] %in% aces & hands[1] %in% facecard)
#> [1] FALSE

I'm almost certain that hand and not hands is what is meant.

Thank you for the wonderful book.

Hello,

The PDF link is pointing to the part-1, the “Introduction to Data Science” book.

I could not find the PDF for this one.