https://ftm2.ircam.fr/index.php?action=history&feed=atom&title=If_method 2026-05-16T08:27:11Z Revision history for this page on the wiki MediaWiki 1.28.0 https://ftm2.ircam.fr/index.php?title=If_method&diff=2612&oldid=prev 2009-05-05T08:45:53Z

<p></p> <p><b>New page</b></p><div>if &lt;num: condition&gt; &lt;any: true value&gt; &lt;any: false value&gt; <br /> <br /> - choose between two values (both conditional values are evaluated)<br /> <br /> The 'if' function (not method) should be pretty clear if you keep in mind the<br /> two drawbacks:<br /> <br /> 1. it is a function, i.e. all arguments are evaluated before the 'if' gets to<br /> decide which one to output, i.e. something like<br /> <br /> (if ($1 != 1) ($myfmat mul 2) ($myfmat zero))<br /> <br /> always multiplies and then zeros the myfmat!<br /> <br /> 2. The result of 'if' can only be one atom, not a list. If you want to output<br /> one list or another, use tuples, with a subsequent ftm.list, or the<br /> soon-to-be-official #untup feature of ftm.mess. This can be used with a 'route'<br /> to send a list out to one or another connection.<br /> <br /> (if ($mydict exists $1) {1 $mydict[$1]} {2 $1 42})<br /> |<br /> ftm.list<br /> |<br /> route 1 2</div>

Beller