Zheyuan Li

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Zheyuan Li has asked 33 questions and find answers to 296 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

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
How to remove any co-occurrence of sub-list elements from vector (R)
Extracting p,d,q values from a fitted ARIMA model in R?
How to find quantiles of an empirical cumulative density function (ECDF)
plot.lm Error: $ operator is invalid for atomic vectors
Product between all combinations of a vector's elements