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Re: Riffle[] accepts only lists. Why?

• To: mathgroup at smc.vnet.net
• Subject: [mg81949] Re: Riffle[] accepts only lists. Why?
• From: Mark Fisher <particlefilter at gmail.com>
• Date: Sun, 7 Oct 2007 05:36:31 -0400 (EDT)
• References: <fe7hq1$op2$1@smc.vnet.net>

On Oct 6, 4:42 am, Szabolcs Horv=E1t <szhor... at gmail.com> wrote:
> Why does Riffle[] accept only lists as its first argument?  All other
> list-manipulation functions, like Append[], Insert[], Cases[] etc. work
> on all kinds of expressions, not just lists.  This seems like an
> unnecessary restriction on Riffle[].
>
> Szabolcs

Good question. In the meantime, try

Fiffle[f_[args___], x_] := f @@ Riffle[{args}, x]

Fiffle[f[a,b,c],x]

--Mark