Shave another 
$i+=($_%2*8-4)/($_*2-1)for 1..1e6;print$i

[download]
or equivalently 
$i+=4*(-1)**$_/(1-$_*2)for 1..1e6;print$i

[download]

In reply to Re: Re: Golf -- compute PI by Anonymous Monk
in thread Golf -- compute PI by Ovid

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