IsRelEqual
The IsRelEqual method checks whether two floating-point numbers of type “LREAL” fall within a specified tolerance.
If both values are greater than the value specified in absCompScale, the relative deviation between the two values is checked against the tolerance. If any of the values fall below the tolerance, an absolute comparison is performed. Among other things, this method is used in the AssertRelEqual method.
Syntax
METHOD IsRelEqual : bool
VAR_INPUT
actual : LREAL;
expected : LREAL;
precision : LREAL;
END_VAR
VAR CONSTANT
absCompScale : LREAL := 1E-12;
END_VAR
Inputs
Name | Type | Description |
|---|---|---|
actual | LREAL | Value determined by executing the test case |
expected | LREAL | Expected value for the test case |
precision | LREAL | Relative tolerance for comparison |
Return value
Name | Type | Description |
|---|---|---|
IsRelEqual | BOOL | Returns the Boolean result of the comparison. |
Example
IsRelEqual (actual:= result, expected:= expectedValue, precision)