https://www.explainxkcd.com/wiki/api.php?action=feedcontributions&feedformat=atom&user=XTheBHox 2026-05-04T01:27:00Z User contributions MediaWiki 1.30.0 https://www.explainxkcd.com/wiki/index.php?title=Talk:2453:_Excel_Lambda&diff=210748 2021-04-22T11:30:12Z

<p>XTheBHox: </p> <hr /> <div>&lt;!--Please sign your posts with ~~~~ and don't delete this text. New comments should be added at the bottom.--&gt;<br /> Another ghost cueball comic! You can see it in the last panel. [[Special:Contributions/108.162.216.54|108.162.216.54]] 06:03, 22 April 2021 (UTC)<br /> <br /> <br /> Someone needs to add an explanation of the Lambda, and possibly how Excel is implementing it. (I suppose it would immediately be useful for cutting down common re-use within a formula line, though =IF(ISERR(FIND(&quot;:&quot;,A1)),A1,RIGHT(A1,LEN(A1)-FIND(&quot;:&quot;,A1))) is a trivial repeat of the FIND, once to check, then again to do, I often need to do far more nested things, check for being a value, repeat the FIND to deal with the LEFT, etc.) But it has the smell of being effectively a Macro in this instance. Which already seems to me to be the only way to run a ''proper'' Turing Machine in an Excel column without hitting Circular Reference issues.<br /> <br /> <br /> Would it be a stretch to say that Turing's inability to prove if Cueball will stop is actually equivalent to the halting problem, except it is for Cueball and not an arbitrary Turing machine? I thought that was pretty funny. [[User:XTheBHox|xTheBHox]] ([[User talk:XTheBHox|talk]]) 11:30, 22 April 2021 (UTC)</div>

XTheBHox