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How can I increase the precision if I have around 45,000.
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In an multinomial expansion I have 45,000 terms to add. The result should be less than 1. However due to addition of so many terms the error also gets magnified; and gives random deviations of significant values in the result. Using double() doesn't help either.
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Jan
2013 年 7 月 9 日
Using "double()" instead of what? Please describe the input data more explicitly.
回答 (2 件)
Jan
2013 年 7 月 9 日
I'm not sure if I understand the problem correctly: You calculate the summ and suffer from the limited accuracy? This would be one effect of the nature of the sum, which is numerical instable. As workaround you can increase the precision to 128 or 196 bit floating point accumulation using the "Knuth" methods in: FEX: XSum.
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