Thread: Can anyone suggest a good free arbitrary-precision C library?

  1. 07-12-2011 #1
    TheBigH
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    Can anyone suggest a good free arbitrary-precision C library?

    Hi everyone,
    I am running some computer simulations that eventually fail due to accumulating rounding errors. I need to improve the precision and would like a decent free library that provides higher or arbitrary precision. There seem to be quite a few out there and since I need to re-work several thousand lines of code I need to be sure of getting one that's reliable, fast, has a transparent syntax and provides all the functions I need.

    GMP seems popular but, after reading the manual, I unfortunately have to rule it out because it has no logarithm function and I do not like the look of the interface.

    Can anyone help?
    Cheers,
    H.
  2. 07-12-2011 #2
    King Mir
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    Can you get away with using long double?
    It is too clear and so it is hard to see.
    A dunce once searched for fire with a lighted lantern.
    Had he known what fire was,
    He could have cooked his rice much sooner.
  3. 07-12-2011 #3
    TheBigH
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    I'm afraid not. That's what I'm currently using.
  4. 07-12-2011 #4
    laserlight
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    You could consider a companion library to GMP: MPFR.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way
  5. 07-12-2011 #5
    TheBigH
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    Thanks, I'll give it a try.
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