** Reduced row echelon form. **

** R = RREF(A) produces the reduced row echelon form of A. **

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** [R,jb] = RREF(A) also returns a vector, jb, so that: **

** r = length(jb) is this algorithm's idea of the rank of A, **

** x(jb) are the bound variables in a linear system, Ax = b, **

** A(:,jb) is a basis for the range of A, **

** R(1:r,jb) is the r-by-r identity matrix. **

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** [R,jb] = RREF(A,TOL) uses the given tolerance in the rank tests. **

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** See also RREFMOVIE , RANK , ORTH , NULL , QR , SVD . **

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