TITLE(backsolve @@ Solve an Upper Triangular System)
USAGE(
backsolve(r, x, k=ncol(r))
)
ALIAS(backsolve)
ARGUMENTS(
ARG(r @@ an upper triangular matrix giving the coefficients for
the system to be solved.  Values below the diagonal are ignored.)
ARG(x @@ a matrix whose columns give ``right-hand sides'' for the equations.)
ARG(k @@ The number or columns of LANG(r) and rows of LANG(x) to use.)
)
VALUE(
The solution of the triangular system.  The result will be a
a vector if LANG(x) is a vector and a matrix if LANG(x) is a matrix.
)
REFERENCES(
Dongarra, J. J., J. R. Bunch, C. B. Moler and G. W. Stewart (1978).
ITALIC(LINPACK Users Guide).  Philadelphia: SIAM Publications.
)
SEEALSO(
LANG(LINK(chol)),
LANG(LINK(qr)),
LANG(LINK(solve)).
)
EXAMPLES(
# no examples yet
)
