以前写过金星西大距。天文学上的大距，指的是在地球上观测地球与太阳之间的行星，相对于太阳位置关系。东大距与西大距，都是水星与太阳相对位置关系变化过程中的一个特定时刻。这一时刻，太阳与水星的视角距离最远。大距前后的一段时间，更适合水星观测。 大距这一概念 ...

A colorbar is the legend for any figure that encodes numbers as color: an image, a heatmap, a filled contour plot. In Matplotlib, fig.colorbar(im, ax=ax) attaches one to an existing plot, and the ...

A heatmap in Matplotlib is a color-coded image of a two-dimensional array, and Axes.imshow is the quickest way to draw one. The official Matplotlib gallery describes it this way: data that depends on ...

Uses the pretrained haarcascade_frontalface_default.xml classifier bundled with the selected OpenCV 4 package. Converts the image to grayscale ...

A Claude Code skill that makes every Python/matplotlib figure Claude draws follow the MDO Lab niceplots style plus a set of publication rules: ...

Machine learning is often used to predict future values from data. But what if, instead of just predictions, you could ...

In the previous article, we compared decision trees and random forests and chose a depth-2 decision tree for predicting ...