## bbmatrix

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

bbmatrix Create a black-box operator from a matrix.
BB=bbmatrix(A) encapsulates the Matlab-matrix A, full or sparse, in a
black-box matrix. This is a handy way to treat sparse matrices, which
are ubiquitous in large-scale computations.
In most cases a product between a black-box operator and a
Matlab-matrix returns a dense matrix for the sake of compatibility.
To avoid this, all arguments should be transformed to black-box form.
BB=bbmatrix(A,'notol') creates a black-box without estimating the
accuracy of the product. This will reduce the construction time
slightly, but also limits the applicable iterative algorithms.
Example:
A=randn(1000,1); B=randn(1,1000);
C1=A*B; C2=bbmatrix(A)*B; C3=bbmatrix(A)*bbmatrix(B);
whos C1 C2 C3
>> Name Size Bytes Class
>> C1 1000x1000 8000000 double array
>> C2 1000x1000 8000000 double array
>> C3 1000x1000 22071 blackbox object
See also blackbox.

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