How to change the group color in collect_classes() heatmap

[Phoenix12580]

I want to change the color, what should I do? Could you give a sample ....? I try the anno_col, but nothing changed.
Thank you very much

[jokergoo]

The global parameter color_set_2 controls class colors. You need to define a named vector of colors where names are 1,2,3....

cola_opt$color_set_2 = structure(2:10, names = 1:9) # assume you have less than 10 classes. 9 colors are enough.
# or in the newest version, names are automatically added
# cola_opt$color_set_2 = 2:10
collect_classes(golub_cola, k = 3)