This function is not yet fully documented. This is a transcript of the text-formatted help.

bbmult  Multiply a black-box operator with a matrix.
   A black-box operator is a set of functions that computes
   matrix-vector products. The operator is only accessed this way.

   Normally, operations with a black-box operator returns a new
   black-box operator. You can use bbmult to get a full result.

   This function is not intended for evaluation of many products,
   such as iterative routines.

   Please see bbfunc or bbfuncm for handling this case.

   See also blackbox, bbfunc, bbfuncm, .