Zheyuan Li

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Zheyuan Li has asked 33 questions and find answers to 301 problems.

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Zheyuan Li questions

Fast group-by simple linear regression
Remove code between #if 0 and #endif when exporting a C file to a new one
256-bit vectorization via OpenMP SIMD prevents compiler's optimization (say function inlining)?
C preprocessing fails to stop immediately after an #error
Write a trackable R function that mimics LAPACK's dgetrf for LU factorization
Without root access, run R with tuned BLAS when it is linked with reference BLAS
How to list all S3 methods defined in a specific package / namespace for a particular generic function
What is the algorithm behind R core's `split` function?
Finding stationary distribution of a markov process given a transition probability matrix
How to ask GCC to completely unroll this loop (i.e., peel this loop)?

Zheyuan Li answers

R Recover original data.frame from model.frame
`dplyr::between` over millions of intervals: how to make it faster
How do I cbind elements of a list that are data.frame of the same row size into one large data.frame
Test whether one factor is nested in another
probit ordinal logistic regression with `MASS::polr`: How to make prediction on new data
Smoothing Continuous 2D Points
How to save the coefficients for each optim iteration?
What is the computational complexity of arima() function in R?
Determine a normal distribution given its quantile information
Slow dot product in R