INVERT Function
Returns an inverted copy of a square array.
Usage
Input Parameters
array—Two-dimensional square array. May be of any data type except string.
Output Parameters
status—(optional) The name of a scalar variable used to accumulate errors from singular or near-singular arrays. Possible values are:
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0—Successful completion.
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1—A singular array, indicating that the inversion is invalid.
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2—A warning that a small pivot element was used and it is likely that significant accuracy was lost.
Returned Value
result—An inverted copy of array.
Keywords
None.
Discussion
An input array of double-precision floating-point data type returns a result of identical type. An input array of any other type yields a result of single-precision floating-point data type.
Errors are accumulated in the optional status parameter, or the math error status indicator. This latter status may be checked using the CHECK_MATH function.
| Note: Unless double-precision floating-point values are used for array, round off and truncation errors may occur, resulting in imprecise inversion. |
INVERT uses the Gaussian elimination method (whose objective is the transformation of the given system into an equivalent system with upper-triangular coefficient matrix).
