Returns, as a scalar function, a value corresponding to the IEEE 754 Standard format of floating point (ANSI/IEEE 1985) for NaN.

Retrieves an error type for the most recently called IMSL routine.

Computes the number of days from January 1, 1900, to the given date.

Gives the date corresponding to the number of days since January 1, 1900.

Solves a system of nonlinear equations using factored secant update with a finite-difference approximation to the Jacobian.

Solves a system of nonlinear equations using factored secant update with a user-supplied Jacobian.

Solves a system of nonlinear equations using a modified Powell hybrid algorithm and a finite-difference approximation to the Jacobian.

Solves a system of nonlinear equations using a modified Powell hybrid algorithm with a user-supplied Jacobian.

Uses a sequential equality constrained QP method.

Uses a sequential equality constrained QP method.

Computes the norm of a rank-1 or rank-2 array. For rank-3 arrays, the norms of each rank-2 array, in dimension 3, are computed.

Computes the 1-norm of a complex band matrix in band storage mode.

Computes the 1-norm of a real band matrix in band storage mode.

Computes the 1-norm of a real matrix.

Computes the Frobenius norm of a real rectangular matrix.

Computes the infinity norm of a real matrix.