Rampal Etienne on Fri, 10 Jun 2005 13:56:57 +0200 |
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precision question |
Dear all, I have a problem with precision in PARI. Suppose we have default(realprecision,30). Then PARI gives > 1E+0 - 1E+0 0.E-38 Is it possible to get > 1E+0 - 1E+0 0 instead?In other words, if I want to calculate 1E+0 - 1E+0 + 1E-40, I want to get 1E-40 and not 0.E-38 which is the answer PARI gives me right now. This is important, because in a PARI program it could occur that the difference of exactly the same number is taken (e.g. log(10/2) - log(2+3) + 1E-40), which then gives the wrong answer.
Rampal