Formula: Errors

Help contents

QFFE_212: "Negative square root argument : 'value'"

Square root argument value is negative.

Cause

• Square root argument value is negative

  sqrt(t+0.5)	Negative square root argument : '-0.5' for t = -1
  sqrt(-asin(-1))	Negative square root argument : '-270'
  sqrt(pi-asin(1))	Negative square root argument : '-86.8584'

• Square root argument value becomes negative due to rounding errors

  sqrt(1 + t - 1 - t)

  Square root from the negative number : '-1e-020' for t = 1e-20

Resolution

• Check that the value of square root argument is never negative.
• If the cause is in rounding errors, try to change the order of operations to reduce their impact.