xponential_lpdf; (reals y | reals mu, reals sigma); -->

<p><code>real</code> <strong><code>double_exponential_lpdf</code></strong><code>(reals y | reals mu, reals sigma)</code><br>The log of the double exponential density of y given location mu and scale sigma</p>
<!-- real; double_exponential_cdf; (reals y, reals mu, reals sigma); -->

<p><code>real</code> <strong><code>double_exponential_cdf</code></strong><code>(reals y, reals mu, reals sigma)</code><br>The double exponential cumulative distribution fun