Important: The linalg package has been deprecated. Use the superseding packages, LinearAlgebra and VectorCalculus, instead.

- For information on migrating linalg code to the new packages, see examples/LinearAlgebraMigration.

The call leastsqrs(A, b) returns the vector that best satisfies  in the least-squares sense. The result returned is the vector x which minimizes .

The call leastsqrs(S, v) finds the values for the variables in v which minimize the equations or expressions in S in the least-squares sense. The result returned is a set of equations whose left-hand sides are from v.

For the linear case, if the third optional argument is 'optimize', the routine will find the optimal least square solution (i.e. the vector x with  being the smallest). At present, the matrix entries must be rationals.

The command with(linalg,leastsqrs) allows the use of the abbreviated form of this command.