Many of users do not use powerful Maxima computer algebra system for systematic work, but for ad hoc algebraic calculations – equations, functions, matrixes, etc. only.
To do this job, it is not useful to download the whole application from a web site.
Function: mat_trace (<M>) Return the trace of the matrix <M>. If <M> isnt a matrix, return a noun form. When <M> is a block matrix, mat_trace(M) returns the same value as does mat_trace(mat_unblocker(m)).