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2.2 Absolute Functions
R
abs
(T x)
absolute value of x
int
int_step
(int x)
int
int_step
(real x)
Return the step function of x as an integer, \[ \mathrm{int\_step}(x)
= \begin{cases} 1 & \text{if } x > 0 \\ 0 & \text{if } x \leq 0 \text{
or } x \text{ is } NaN \end{cases} \] Warning: int_step(0)
and int_step(NaN)
return 0 whereas step(0)
and step(NaN)
return 1.
See the warning in section step functions about the dangers of step functions applied to anything other than data.