Assigning to an array slice gets you nearly what you want:

@bin[@pos] = (1) x @pos; #(undef, undef, 1, undef, 1, undef, 1, undef,
+ undef, 1)

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That may be good enough, it depends on what you intend to do with @bin. To get the output you requested, follow the above with: 

$_ ||= 0 for @bin; #(0, 0, 1, 0, 1, 0, 1, 0, 0, 1)

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Update:

Or, you could do the whole lot in reverse (given your revised spec):

my @bin2 = (0) x 15;      # assign 15 zeros
@bin2[@pos] = (1) x @pos; # fill in the 1's

[download]

In reply to Re: sequence of positions to binary sequence by FunkyMonk
in thread sequence of positions to binary sequence by coldy

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