'big square root' for BigDecimal

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Jeremy Watts - 26 May 2005 13:29 GMT

hi,

is there a 'big square root' feature to find square roots of BigDecimal
numbers?

thanks

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Roland - 26 May 2005 14:06 GMT

> hi,
>
> is there a 'big square root' feature to find square roots of BigDecimal
> numbers?
>
> thanks

Since BigDecimal doesn't seem to provide a sqrt method (neither
pow(0.5)), you'll have to implement it yourself
<http://en.wikipedia.org/wiki/Square_root#Computing_square_roots>
or use Google to find an implementation
<http://www.google.com/search?hl=en&q=BigDecimal+%22square+root%22>

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Regards,

Roland de Ruiter
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klynn47@comcast.net - 26 May 2005 16:00 GMT

Are you familiar with the Newton-Raphson Method?

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Jeremy Watts - 26 May 2005 20:41 GMT

> Are you familiar with the Newton-Raphson Method?

yes its not the implementation thats a problem - just didnt want to waste
effort writing a routine, if indeed a method did exist.

and yes i am familiar with newton-raphson and is indeed the method i intend
to use

thanks

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Boudewijn Dijkstra - 26 May 2005 22:01 GMT

>> Are you familiar with the Newton-Raphson Method?
>
[quoted text clipped - 3 lines]
> and yes i am familiar with newton-raphson and is indeed the method i intend
> to use

In that case you already realised that the result of the doubleValue() method
is an excellent starting guess for the algorithm.

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'big square root' for BigDecimal

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