qrsol

Purpose

Computes the solution of \(Rx = b\) where \(R\) is an upper triangular matrix.

Format

x = qrsol(b, R)

Parameters:

• b (PxL matrix) – data
• R (PxP matrix) – upper triangular matrix

Returns:

x (PxL matrix) – solution of \(Rx = b\) where \(R\) is an upper triangular matrix.

Remarks

qrsol() applies a backsolve to \(Rx = b\) to solve for x. Generally R will be the R matrix from a QR factorization. qrsol() may be used, however, in any situation where R is upper triangular.

Source

qrsol.src

See also

Functions qqr(), qr(), qtyr(), qrtsol()