ggplot2: use geom_line() carefully when your x-axis data are descending
Given 3 points, $(1,1), (2,1), (2,2)$, how would you connect them with 2 segments? Subtly, geom_line of ggplot2 thinks in a different way when you order the ...
Recent Posts
Python: How to pip-install packages in virtualenv
My aim is to install ALL packages I need for a project to a non-default location.
scikit-learn: init your estimator lightly and fit heavily
If you run cross_validate(n_jobs > 1) with your own estimator, pay attention that your estimator will be copied per job.
scipy: pdist indexing
scipy.spatial.distance.pdist(X) gives the pair-wise distances of X, $\operatorname{dist}(X[i], X[i])$ not included. The distances are stored in a dense matri...
scikit-learn: A walk through of GroupKFold.split()
Suppose $X[\text{“groups”}] = \begin{bmatrix} a \newline b \newline b \newline c \newline c \newline c \end{bmatrix}$ and n_splits=3.
Pandas: split a DataFrame into chunks
Prepare a test dataset:
Check the header of Columbia Eigen tab delimited files
Precomputed Eigen scores are available at Download Eigen/Eigen-PC scores.
R: Graphics Tricks
总结自 R Graphics Cookbook
SQL: Autocommit does not guarantee immediate committing
If you just google, you may find autocommit a vaguely defined term.