IMSL_INV

Syntax | Return Value | Arguments | Keywords | Example | Errors | Version History

The IMSL_INV function computes the inverse of a real or complex, square matrix.

Note
This routine requires an IDL Advanced Math and Stats license. For more information, contact your ITT Visual Information Solutions sales or technical support representative.

Syntax

Result = IMSL_INV(a [,/DOUBLE])

Return Value

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

Arguments

a

Two-dimensional matrix containing the matrix to be inverted.

Keywords

DOUBLE

If present and nonzero, double precision is used.

Example

RM, a, 3, 3 
; Define the matrix to be inverted. 
row 0: 1 3 3 
row 1: 1 3 4 
row 2: 1 4 4 
ainv = IMSL_INV(a) 
; Call IMSL_INV to perform the inversion. 
PM, a 
; Output the original matrix. 
 1.00000      3.00000      3.00000 
 1.00000      3.00000      4.00000 
 1.00000      4.00000      4.00000 
    
PM, ainv 
; Output the computed inverse. 
  4.00000     -0.00000     -3.00000 
     0.00000     -1.00000      1.00000 
    -1.00000      1.00000      0.00000 
PM, a # ainv 
; Check the results. 
 1.00000      0.00000      0.00000 
 0.00000      1.00000      0.00000 
 0.00000      0.00000      1.00000 

Errors

Fatal Errors

MATH_SINGULAR_MATRIX—Input matrix is singular.

Version History