backsolve {base}

R Documentation

Solve an Upper Triangular System

Usage

backsolve(r, x, k=ncol(r))

Arguments

r	an upper triangular matrix giving the coefficients for the system to be solved. Values below the diagonal are ignored.
x	a matrix whose columns give “right-hand sides” for the equations.
k	The number or columns of r and rows of x to use.

Value

The solution of the triangular system. The result will be a a vector if x is a vector and a matrix if x is a matrix.

References

Dongarra, J. J., J. R. Bunch, C. B. Moler and G. W. Stewart (1978). LINPACK Users Guide. Philadelphia: SIAM Publications.

See Also

chol, qr, solve.

Examples

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