I've rewritten how GSLL handles data (vectors, matrices, etc.) so that it is clearer how types are mapped, and the various macros use the same definitions to figure out how to translate from one form to another (e.g. Lisp side to C side). This should make maintenance and adding new vector and matrix types easier. For the most part, this is largely invisible to the library user, except that the GSL object names vector-single, vector-double, matrix-single, matrix-double now have "-float" appended: vector-single-float, vector-double-float, matrix-single-float, matrix-double-float. Because of all the examples/tests using one or more of these, many files were touched. The regression tests all pass as well as they did before, so I think I got everything updated. I wanted to alert you in case your code uses these objects. Liam