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TiM [L1 ]
CBLAS from critlib
Ed Hume's pure-Tcl linear algebra package [L2 ]
NArray [L3 ]
LinearAlgebra Tcllib::linearalgebra for users of Tcl8.4 (and possibly earlier) for vectors, matrices and linear equation solvers. Documented in the Help pages.
Ratcl is starting to get some vector/matrix operators.
TclMatrix3d an RPN expression command for affine transformations
3d Matrix Inversion inverts 3x3 matrices
matrix in PLplot
Matrix incr tcl class in a small operating-point circuit simulator
TIP#314 [L4 ] contains as an example an ensemble for doing matrix arithmetic over arbitrary rings.
3D rotation matrices can be constructed in Euler Angles.
Tcl Matrix Type : "implements a new object type for Tcl which looks like a nested list of doubles but is stored internally as a 2d matrix. Conversion to and from string values is only done as needed so that matrices can be passed by value efficiently in tcl scripts. "