assert_atancond — Computes the condition number of the atan function.
[c,y] = assert_atancond ( x )
a n-by-m matrix of doubles
a n-by-m matrix of doubles, the condition number
a n-by-m, matrix of doubles, the function values
Computes the condition number of the atan function. The atan function is well conditionned: it always has a condition number lower than 1.
<latex> \begin{eqnarray} c(x) = \left| \frac{x}{\sqrt{1+x^2}\arctan(x)} \right| \end{eqnarray} </latex>