## bbcompare

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

bbcompare Compare two black-box operators.
bbcompare(BB1,BB2) tests whether two operators are identical
up to rounding-errors. It generates a number of test-vectors
which it multiplies.
This is convenient for testing whether an operator is
implemented correctly. It is often possible to create a full
matrix for some small examples, which can be used to validate
an implementation.
[suc,msg,warn]=bbcompare(BB1,BB2) returns true if the test
passed and false otherwise. It also creates an message
describing why the test failed or succeeded. The least
output is a string with non-fatal warnings.
bbcompare(BB1,BB2,K) uses K test-vectors. If K is a vector,
the test is performed as a series of matrix-matrix evaluations
with the i'th test using K(i) vectors at a time. This is handy
when testing if matrix-matrix multiplications are correct.
The comparison is done using 4*sum(K) evaluations:
right- and left-multiplication with real and complex vectors.
See also bbtauest.

bbclearbbconst