如何理解dotplot

如何理解dotplot

这种图，看起来真的费劲。这么费劲的图，只会给人带来无尽的困扰：

dotplot

A quick way to check the expression of these genes per cluster is to using a dotplot. This type of plot summarizes two types of information: the color represents the mean expression within each of the categories (in this case in each cluster) and the dot size indicates the fraction of cells in the categories expressing a gene.

Also, it is also useful to add a dendrogram to the graph to bring together similar clusters. The hierarchical clustering is computed automatically using the correlation of the PCA components between the clusters.

Core plotting functions — Scanpy documentation

横着看：就是每个cluster

纵着看：就是每个基因；

点的大小，代表，这个类：有多少了比例的细胞表达了这个基因？

点的颜色，代表，这些表达该基因的细胞，平均表达量是多少？