it's simple 
my @arr = (2,4,9);
my @rslt;

$rslt[$_]=1 for @arr;
$_ or ($_ = 0) for  @rslt;

print "@rslt";

#0 0 1 0 1 0 0 0 0 1

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

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