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Diffstat (limited to 'docs/doc/undo.html')
| -rw-r--r-- | docs/doc/undo.html | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/docs/doc/undo.html b/docs/doc/undo.html index 64d8ab53..f2082a10 100644 --- a/docs/doc/undo.html +++ b/docs/doc/undo.html @@ -38,7 +38,7 @@ <p>A few notable inverses are the <a href="arithmetic.html#basic-arithmetic">logarithm</a> <code><span class='Function'>⋆</span><span class='Modifier'>⁼</span></code>, <a href="transpose.html">un-Transpose</a> <code><span class='Function'>⍉</span><span class='Modifier'>⁼</span></code>, and <a href="replicate.html#inverse">Indices inverse</a> <code><span class='Function'>/</span><span class='Modifier'>⁼</span></code>. <a href="enclose.html">Enclose</a> inverse, <code><span class='Function'><</span><span class='Modifier'>⁼</span></code>, is an alternative to <a href="pick.html#first">First</a> that requires its argument to be a unit array.</p> <p>Structural functions like <a href="take.html">Take</a> and <a href="shift.html">shifts</a> that remove elements from <code><span class='Value'>𝕩</span></code> can't be inverted, because given the result there's no way to know what the elements should be. However, there are two special cases that have inverses defined despite losing data: these are <code><span class='Function'>⊣</span><span class='Modifier'>⁼</span></code> and <code><span class='Value'>k</span><span class='Modifier'>⁼</span></code> where <code><span class='Value'>k</span></code> is a constant (a data type, or <code><span class='Value'>k</span><span class='Modifier'>˙</span></code>). For these, <code><span class='Value'>𝕩</span></code> is required to <a href="match.html">match</a> the always returned value <code><span class='Value'>𝕨</span></code> or <code><span class='Value'>k</span></code>, and this value is also used for the result—even though any result would be valid, as these functions ignore <code><span class='Value'>𝕩</span></code>.</p> <a class="replLink" title="Open in the REPL" target="_blank" href="https://mlochbaum.github.io/BQN/try.html#code=MyDiiqPigbwgNAozIOKKo+KBvCAz">↗️</a><pre> <span class='Number'>3</span> <span class='Function'>⊣</span><span class='Modifier'>⁼</span> <span class='Number'>4</span> -ERROR +<span class='Error'>Error: ⁼: Inverse does not exist</span> <span class='Number'>3</span> <span class='Function'>⊣</span><span class='Modifier'>⁼</span> <span class='Number'>3</span> 3 </pre> |