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<h3>Raymond Toy pushed to branch master at <a href="https://gitlab.common-lisp.net/cmucl/cmucl">cmucl / cmucl</a></h3>
<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.common-lisp.net/cmucl/cmucl/commit/fab01803f386f8a7ce697ea58d26d07052297091">fab01803</a></strong>
<div>
<span>by Raymond Toy</span>
<i>at 2015-12-19T09:46:21Z</i>
</div>
<pre class='commit-message'>Add atanh tests.</pre>
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<h4>1 changed file:</h4>
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<a href='#diff-0'>
tests/fdlibm.lisp
</a>
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<h4>Changes:</h4>
<li id='diff-0'>
<a href='https://gitlab.common-lisp.net/cmucl/cmucl/commit/fab01803f386f8a7ce697ea58d26d07052297091#diff-0'>
<strong>
tests/fdlibm.lisp
</strong>
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<pre class="highlight"><code><span style="color: #000000;background-color: #ffdddd">--- a/tests/fdlibm.lisp
</span><span style="color: #000000;background-color: #ddffdd">+++ b/tests/fdlibm.lisp
</span><span style="color: #aaaaaa">@@ -310,6 +310,26 @@
</span> (assert-eql 710.4758600739439d0 (asinh x))
(assert-eql -710.4758600739439d0 (asinh (- x)))))
<span style="color: #000000;background-color: #ffdddd">-
-
-
</span>\ No newline at end of file
<span style="color: #000000;background-color: #ddffdd">+(define-test atanh-basic-tests
+ (:tag :fdlibm)
+ (assert-eql +0d0 (atanh +0d0))
+ (assert-eql -0d0 (atanh -0d0))
+ ;; atanh(x) = x, |x| < 2^-28
+ (let ((x (scale-float 1d0 -29)))
+ (assert-eql x (atanh x))
+ (assert-eql (- x) (atanh (- x))))
+ ;; atanh(0.25) = log(5/3)/2, |x| < 0.5
+ (let ((x 0.25d0))
+ (assert-eql 0.25541281188299536d0 (atanh x))
+ (assert-eql -0.25541281188299536d0 (atanh (- x)))
+ ;; There's no guarantee that atanh(1/4) = log(5/3)2 in floating
+ ;; point, but it's true in this case with fdlibm
+ (assert-eql (/ (log (float 5/3 1d0)) 2) (atanh x)))
+ ;; atanh(0.75) = log(7)/2, 0.5 < |x| < 1
+ (let ((x 0.75d0))
+ (assert-eql 0.9729550745276566d0 (atanh x))
+ (assert-eql -0.9729550745276566d0 (atanh (- x)))
+ ;; There's no guarantee that atanh(3/4) = log(7)2 in floating
+ ;; point, but it's true in this case with fdlibm
+ (assert-eql (/ (log 7d0) 2) (atanh x))))
+
</span>\ No newline at end of file
</code></pre>
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