..perhaps i can place another question that may be informative -

somehow in my mathematics education (up to trig, and, several centuries ago) i didn't seem to be introduced to the concept of matrices, which seem to be common in 3d.

are there perhaps different cultivars of matrices, and if so, can i discretise which ones i should be familiar with? or is a matrix used in dsp/math a matrix, end of story. ?? tia