Zheyuan Li

Zheyuan Li has asked 34 questions and find answers to 336 problems.

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Zheyuan Li questions

get x-value given y-value: general root finding for linear / non-linear interpolation function
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

Zheyuan Li answers

How does R predict function calculate confidence intervals? [duplicate]
Computing pairwise Hamming distance between all rows of two integer matrices/data frames
Writing a Householder QR factorization function in R code
Prediction of 'mlm' linear model object from `lm()`
Correlation/p values of all combinations of all rows of two matrices
What is the red solid line in the "residuals vs leverage" plot produced by `plot.lm()`?
Get indices of two values that bracket zero in R
Histogram and qqplot next to each other with par - does not show in PDF
Looping linear models for multiple files in directory
R: approximating `e = exp(1)` using `(1 + 1 / n) ^ n` gives absurd result when `n` is large