Re: need something like ReplaceAllIndexed[]
- To: mathgroup at smc.vnet.net
- Subject: [mg108481] Re: need something like ReplaceAllIndexed[]
- From: Albert Retey <awnl at gmx-topmail.de>
- Date: Fri, 19 Mar 2010 06:45:31 -0500 (EST)
- References: <hnva5p$88b$1@smc.vnet.net>
Hi,
>
> I have an expression like this:
>
> b[ a[c], a[c], a[d]]
>
> a list like this:
>
> {e,f,g}
>
> I want to end up with
>
> b[ a[e], a[f], a[g]]
>
> I think of this as interleaving a list into an expression, but all my
> tries with ./,.//,MapIndexed[],MapAt[], Partition[Riffle[]] have come
> to no avail.
>
> Any help on this is greatly appreciated.
>
> Roger Williams
> Franklin Laboratory
> http://www.youtube.com/congruentlight
one way with MapIndexed:
expr = b[a[c], a[c], a[d]]
list = {e, f, g}
MapIndexed[Head[#1][list[[#2[[1]]]]] &, expr]
hth,
albert