Re^2: root function

linux:

$ perl -le'print -3 ** (1/3)'
-1.44224957030741
[download]

ActivePerl:

>perl -le"print -3 ** (1/3)"
-1.44224957030741
[download]

Update: Oops, precedence problem

$ perl -le'print( (-3) ** (1/3) )'
nan
[download]

>perl -e"print( (-3) ** (1/3) )"
-1.#IND
[download]

Comment on Re^2: root function Select or Download Code

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Re^3: root function by psini (Deacon) on Jun 21, 2008 at 21:42 UTC
`sini@ordinalfabetix:~$ perl -le"print ((-3)(1/3));" nan sini@ordinalfabetix:~$` [download] Exponent operator has higher priority than unary minus so you are doing -(3(1/3)) instead of ((-3)(1/3)). This gives you accidentally the right result but it would tell you that square root of -2 == -1.414265... Careful with that hash Eugene.	[reply] [d/l]
Re^4: root function by ikegami (Patriarch) on Jun 21, 2008 at 21:58 UTC
Too slow! This gives you accidentally the right result but it would tell you that square root of -2 == -1.414265... But -1.414265... is a square root of 2. :) Update: Ack! ignore this post.	[reply]
Re^5: root function by sasdrtx (Friar) on Jun 21, 2008 at 23:17 UTC
More to the point: it is not the square root of -2. sas	[reply]
Re^5: root function by psini (Deacon) on Jun 21, 2008 at 22:03 UTC
Too slow? No, it is only that if I wait before answering, my answers worth more... proposition for Voting system :) Careful with that hash Eugene.	[reply]