Hi All,

Just wanted to understand how to determine the cube root of a double value. I know that to determine square root we user Math.sqrt(num).

In fact how do we determine fourth root, fifth root (nth root)??

I'd be grateful if you could let me know.

Have a great day,
BTW, Happy new year to y'all.
Kaizer.

Kaizer Billimoria
Bangalore, India

__________________
Kaizer Billimoria
Bangalore, India

This url might help:
http://p2p.wrox.com/post.asp?method=...10&FORUM_ID=20

Cheers

Martyn

I don't know anything about Java, but if it's got the ability to calculate the log of a number then you can easily do nth roots like this:
take the log of the number you want to find the nth root of
divide the log by n
take the exponent (inverse log) of the result and that's the nth root

so in pseudo-code:
nthroot = exponent( log(number) / n )

hth
Phil

Hi Martyn, pgtips,

Martyn, your url takes me to a blank reply screen... humbly suggest you retry. Thanks in advance..

pgtips, i assume that when you say log you mean log (base 10) and not log (base 2). i believe you mean common logarithms? If that is the case yup java does have that log-ability...thanks for your inputs i'll try it out anyhow.

Have a great day.
kaizer.



Kaizer Billimoria
Bangalore, India

I was actually thinking of the natural logarithm (base e), but it doesn't matter which base of log you use as long as you use the corresponding inverse log.

pgtips,
Thanks for the clarification. before i run along and try it out just one more clarification... what does n represent in your solution? is it the number itself or is it something else?
kaizer

Kaizer Billimoria
Bangalore, India

Sorry, I obviously posted the wrong link. Here's what I should have posted: http://mathforum.org/library/resource_types/applets/

Cheers

Martyn

Thanks Martyn
Appreciate it.
Kaizer

Kaizer Billimoria
Bangalore, India

You wanted the nth root, so that's what n represents. If you want the cube root, set n=3. The number itself is represented by the word 'number'.

thanks pgtips, sometimes the obvious is not so obvious.:D

have a great day,

kaizer

Kaizer Billimoria
Bangalore, India