I don't think this is really possible. What you can do is use this [expr if($f1 > 0, 1, 0)] and connect it to [sel 0] and use [sel]'s right outlet only...

On Fri, Feb 19, 2016 at 6:17 PM, Jonghyun Kim <agitato816@gmail.com> wrote:
hi list,

how to *do nothing* when expr if is FALSE?

like this: [expr if ($f1 > 0, 1, *do_nothing*)]

thanks,
jonghyun

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