mrcactu5

Joined 14 years ago

Karma

470

Submissions

581

Member since

Dec 5

View on Hacker News

Recent submissions

Comment · 5 years ago

There's a random shuffle function. Instead of writing one out using an algorithms textbook. Lots of data types get randomly shuffled during coding.

Shuffles arrays and lists. https://numpy.org/doc/stable/reference/random/generated/nump...

Comment · 6 years ago

has anyone seen "The Stacks Project" ? it's very technical but it's nice and collaborative https://stacks.math.columbia.edu/

Comment · 6 years ago

here's a Linear Algebra course from Columbia University with a bit of computer science emphasis. https://tonydear.github.io/teaching/coms3251

Comment · 6 years ago

there are lists of math and physics textbooks on github. maybe these are helpful https://github.com/carlosal1015/Books

Comment · 6 years ago

what are the good freshmen level chemistry textbooks these days ?

Comment · 6 years ago

Everybody drinks soda misses the garbage can, so these people are making the bottle and can recycling market more efficient.

Comment · 7 years ago

if all I want to to is build a Super Mario clone is the knowledge of the 6502 assembly language still necessary ?

Comment · 7 years ago

Here's a scissor's congruence app on github

https://dmsm.github.io/scissors-congruence/

Comment · 7 years ago

last year's US Sudoku Team Qualifier was held online at some point. Possibly in May or July.

http://wpc.puzzles.com/ussq2019/

Comment · 7 years ago

is Levenshtein distance a "metric" in the sense of "metric spaces"? For example, the TaxiCab metric.

https://en.wikipedia.org/wiki/Taxicab_geometry

https://en.wikipedia.org/wiki/Metric_(mathematics)

Also, this looks like could be related to the Hamming Code ? Error correcting codes.

https://en.wikipedia.org/wiki/Hamming_distance

Comment · 7 years ago

This shows the thrown ball (from Freshman physics) should follow a parabolic arc rather than a straight line.

https://en.wikipedia.org/wiki/Principle_of_least_action

Comment · 7 years ago

how does this compare to Fast Fourier transform ?

https://en.wikipedia.org/wiki/Fast_Fourier_transform

Or the Discrete Cosine Transform ?

https://en.wikipedia.org/wiki/Discrete_cosine_transform

Or the Gabor Transform ?

https://en.wikipedia.org/wiki/Gabor_transform

Comment · 7 years ago

He does a numerical computation of the complex powers of 10 (to five decimal places) and they still are on the unit circle. And this was done in 1963.

Comment · 7 years ago

http://mathworld.wolfram.com/PerpendicularBisector.html

Comment · 7 years ago

https://regexper.com/