Hallo!
Title pretty much says it all... none of the mtx objects help files seem to be in the builds. I haven't updated my dev layout in a while but they're present in externals/iem/iemmatrix/doc and abs here.
Also having the creation issue when using the symbolic representations of operators, e.g. mtx_<= will not create until mtx_le has been. I remember reading about this before and can't remember the outcome, so apologies if this is redundant information.
As far as I can see the iemmatrix-objects are not build at all for pd-extended (at least not in externals/makefile) - so also the help patches won't be installed ...
LG Georg