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$\begingroup$ Sow? Reap? So we're farmers now?! Nice solution. I'll wait for more answers/comments before accepting this one $\endgroup$

QuantumDot
– QuantumDot

2014-08-17 21:00:51 +00:00
Commented Aug 17, 2014 at 21:00
1

$\begingroup$ @QuantumDot For what it's worth I would also use Sow and Reap, but I would not put Sow inside fNew as I would not assume that it will evaluate (fNew might hold its arguments). I would use: expr /. f[x_] :> (Sow @ x; fNew @ x) $\endgroup$

Mr.Wizard
– Mr.Wizard

2014-08-18 03:09:42 +00:00
Commented Aug 18, 2014 at 3:09

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