Exponentail operations using BIGDECIMAL

hi all
Can u someone provide me links, notes, codes and suggestions to perform exponential operations using BigDecimal.
Thankz in advance
Arun :)

If you require greater precision than double provides
and your exponent is integer try
Google [
[url=http://www.google.com/search?hl=en&ie=UTF-8&q=squa
e+and+multiply&btnG=Google+Search]square and
multiply ]Good point. I forgot the obvious. m^2 = m * m, etc.

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Using bigdecimal class

I was using Gregory-Leibniz series to calculate PI = 4 - 4/3 + 4/5 - 4/7 + 4/9 - 4/11 + ...
Something like:
double pi = 0.0;
       int limit = 3000000;
       for (int i = 0, y = 1; i <= limit; y+=2, i++)
                 if (y == 1)
                      pi = 4;
               else if (i % 2 == 0)
                      pi += (double)4/y;
                 else
                      pi -= (double)4/y;
                 System.out.println(String.format("Loop %d: %.20f", i, pi));                                    }Then I realized PI isn't going to be totally accurate according to IEEE Standard for Binary Floating-Point Arithmetic that java math calculation uses, so I was trying to use BigDecimal class (new to me), this is what I got initally...
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              if (y == 1)
                      pi = new BigDecimal("4.0");
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                      pi = pi.add(new BigDecimal( Double.toString( (double) 4 / y )));
                 else
                      pi = pi.subtract(new BigDecimal( Double.toString( (double) 4 / y )));
                    System.out.println(String.format("Loop %d: %s", i, pi.toString()));
I realize that when I do the 4/y calculations involving both doubles... the result is probably stored according to the IEEE standards which is the thing to avoid... Is that correct? Is my PI result going to be accurate?
I noticed with this one decimals up to the 22nd place are all filled with some numbers in the calculations compared with the first one involving only double number calculations which had zero's starting around the 15th decimal.
Something like doesn't work and ends up with arithmeticexceptions...
pi = pi.subtract(new BigDecimal("4").divide(new BigDecimal(Integer.toString(y))));
So I'm actually confused about the right way of using BigDecimal class in this type of calculation to get accurate results. I do realize it's an immutable class and probably a bad idea to use it like this 3 million times in a loop.

quoting from the API documentation on BigDecimal
"The BigDecimal class gives its user complete control over rounding behavior. If no rounding mode is specified and the exact result cannot be represented, an exception is thrown; otherwise, calculations can be carried out to a chosen precision and rounding mode by supplying an appropriate MathContext object to the operation."
That explains the arithmetic exceptions.
You would be advised to choose your scale first, (that would be the number of decimal places that you want to be using for your calculation. ) Then use the BigDecimal constructors that use the scale value. Construct your BigDecimal 4 outside of the loop so that you are not constructing it over and over again. And finally, read the documentation on how the scale of the result will depend upon the scale of the components going in.
A little reading and possibly re-reading of the documentation will help in the understanding of the BigDecimal class.

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Hi,
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Hi all,
I am doing some mathematical calculations using float variables. They are not working properly because of rounding issues....So, before I change the whole program to do the same calculations using BigDecimal, just wanted to check out whether there are any catches in that also. Like, is it safe if I do BigDecimal.add, subract etc. instead of addding the floating point numbers directly.....Can I be assured that the results will be precise, to 2 decimal places?
Any help will be appreciated...
Thanks

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Determine Number of Decimal Place using BigDecimal

I was interested to have the following getNumberOfDecimalPlace function :
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System.out.println("1.0 = " + Utils.getNumberOfDecimalPlace(1.0)); // 0
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0.0
0 = 1
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1.0 = 1
1.01
1.01 = 2
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1.012 = 3
0.01
0.01 = 2
0.012
0.012 = 3
Any solution?

Please [don't cross-post!|http://stackoverflow.com/questions/2296110/determine-number-of-decimal-place-using-bigdecimal], it's considered rude. If you must do it, then at least link each post so that people can find out which answers you've already got in order to avoid duplicate work on our part.
Please read [_How To Ask Questions The Smart Way_|http://www.catb.org/~esr/faqs/smart-questions.html].

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Thanking You.

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i created routing using LSMW.
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Dear,
Now I am clear.
You need to create different 2 BOM and with BOM items, as below,
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- reading the positiondata of the given routing (the one which is to be copied)
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Upload Multiple Operation using BAPI_ROUTING_CREATE

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Well actually that´s almost exactly what my task is as well.
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then calling the BAPI_ROUTING_CREATE while exporting the headdata and the positiondata to the BAPI.
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Why i can't make a normal video call over my cellular operator using by iphone 4s ????!!!! is it possible that if my mobile is iphone so i can not contact (Video Call - or Send Files over Bluetooth ) people do not have iphone ??????!!!!!!!!!

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Exponentail operations using BIGDECIMAL

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