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Calculating a square root using exponentiation (**)


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  #1  
Old November 15th, 2012, 12:21 PM
EJF EJF is offline
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Calculating a square root using exponentiation (**)
This is really a math question rather than a Python question, and I feel very dense for not being able to figure it out. I'm reading a book on Python and it introduces the math library as a source of useful functions, like sqrt. Then it says, as an aside, "We could have taken the square root using exponentiation **. (Can you see how?)"

Unfortunately, I can't see how. Can anyone help me?

Thanks.

Eric
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Old November 15th, 2012, 12:30 PM
SuperOscar SuperOscar is offline
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Quote:
Originally Posted by EJF
Unfortunately, I can't see how. Can anyone help me?


Kinda basic math.

Code:
>>> 256**(1/2)
16.0
>>> import math
>>> math.sqrt(256)
16.0
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b49P23TIvg agrees: (works in python3) also, math.exp(math.log(256)/2)
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Old November 15th, 2012, 01:31 PM
EJF EJF is offline
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Quote:
Originally Posted by SuperOscar
Kinda basic math.

Code:
>>> 256**(1/2)
16.0
>>> import math
>>> math.sqrt(256)
16.0


Thanks, SuperOscar. Boy do I feel stupid.

Eric
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