INV Function

INV Function

Computes the inverse of a real or complex, square matrix.

Usage

result = INV(a)

Input Parameters

a—Two-dimensional matrix containing the matrix to be inverted.

Returned Value

result—A two-dimensional matrix containing the inverse of the matrix A.

Input Keywords

Double—If present and nonzero, double precision is used.

Example

; Define the matrix to be inverted.

RM, a, 3, 3

row 0: 1 3 3

row 1: 1 3 4

row 2: 1 4 4

; Call INV to perform the inversion.

ainv = INV(a)

; Output the original matrix.

PM, a

; PV-WAVE prints the following:

; 1.00000      3.00000      3.00000

; 1.00000      3.00000      4.00000

; 1.00000      4.00000      4.00000

; Output the computed inverse.

PM, ainv

; PV-WAVE prints the following:

; 4.00000     -0.00000     -3.00000

; 0.00000     -1.00000      1.00000

; -1.00000      1.00000      0.00000

; Check the results.

PM, a # ainv

; PV-WAVE prints the following:

; 1.00000      0.00000      0.00000

; 0.00000      1.00000      0.00000

; 0.00000      0.00000      1.00000

Fatal Errors

MATH_SINGULAR_MATRIX—Input matrix is singular.