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Java Forum / General / February 2007BigDecimal to power of BigDecimal
Hi, I have a problem with calculating expression, in which I have to use BigDecimal1 ^ BigDecimal2 BigDecimal.pow() isn't suitable - as far as I know, it requires int as an parameter, and both my numbers are BigDecimals. Does anyone know how to handle it? sfetr > Hi, > [quoted text clipped - 6 lines] > > Does anyone know how to handle it? bd1.pow(bd2.intValue()) looks like a good starting point. If bd2 has a fractional part, you'll need to work harder -- perhaps Math.pow(bd1.doubleValue(), bd2.doubleValue()) would be of use, followed by conversion from double to BigDecimal. Seems like a strange thing to want to do, though. I hope you've got lots of memory ...  SignatureEric Sosman esosman@acm-dot-org.invalid >> Hi, >> [quoted text clipped - 14 lines] > Seems like a strange thing to want to do, though. I hope > you've got lots of memory ... Even if the double approach does not give enough accuracy, it might be a good starting point for an iterative improvement algorithm such as Newton-Raphson. However, it definitely needs to be dome carefully, with attention to trade-offs between accuracy and memory. Patricia Thanks a lot, problem vanished :-) Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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