ma
dropping constant additive terms</p>
<!-- real; weibull_cdf; (reals y, reals alpha, reals sigma); -->
<p></p>
<p><code>real</code> <strong><code>weibull_cdf</code></strong><code>(reals y, reals alpha, reals sigma)</code><br>
The Weibull cumulative distribution function of y given shape alpha
and scale sigma</p>
<!-- real; weibull_lcdf; (reals y | reals alpha, reals sigma); -->
<p></p>
<p><code>real</code> <strong><code>weibull_lcdf</code></strong><code>(reals y | reals alpha, reals sigma)</code><br>
The 