Tau function: Difference between revisions
→{{header|RPL}} Optimized version
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===Optimized algorithm===
{| class="wikitable"
! RPL code
! Comment
|-
|
≪
DUP √ DUP FP 0 -1 '''IFTE'''
1 ROT '''FOR''' j
OVER j MOD NOT DUP + +
'''NEXT''' SWAP DROP
≫ ‘TAU’ STO
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''( n -- tau(n) )''
counter set at -1 if n square, 0 otherwise
while j ≤ n²
add 2 to counter for each dividing j
forget n
|}
=={{header|Ruby}}==
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