Formula: Errors
QFFE_209: "Illegal 'acos' argument : 'value'"
Arc cosine of the argument can not be calculated.
Cause
- Arc cosine argument is either less than -1 or greater than 1
acos(log(3)) Illegal 'acos' argument : '1.09861' - Arc cosine argument becomes either less than -1 or greater than 1 due to
rounding errors
acos(1e300 / 1e150 ^ 2) Illegal 'acos' argument : '1'
Resolution
- Check that the value of arc cosine argument is between -1 and 1.
- If the cause is in rounding errors, try to change the order of operations to reduce their impact.