Just another take: 
#!perl
use strict;
# BrowserUK's function defs
my %funcs = (
    power => sub { return exp( $_[0] ) },
    log2  => sub { return log( $_[0] )/log(2.0) },
    loge  => sub { return log( $_[0] ) },
    log10 => sub { return log( $_[0] )/log(10.0) },
    round => sub { return int( $_[0] + $_[ 0 ] < 0 ? -0.5 : 0.5 ) },
    trunc => sub { return int($_[0]) },
    f1    => sub { return sprintf "%.1f", $_[0] },
    f2    => sub { return sprintf "%.2f", $_[0] },
    f3    => sub { return sprintf "%.3f", $_[0] },
    f4    => sub { return sprintf "%.4f", $_[0] },
    f5    => sub { return sprintf "%.5f", $_[0] },
);

my $A = shift;
my $chosen = $funcs{$A} or die "No such func $A\n";
s/(?<=\s)(\S+)/$chosen->($1)/ge, print while <>;

[download]
Update: changed from \w to \S.
Caution: Contents may have been coded under pressure.

In reply to Re: Dynamic function chains? by Roy Johnson
in thread Dynamic function chains? by keymon

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