Yes, it did work. Now the compiler (gcc) is accepting converting mpreal to int.

The package is very nice

Many thanks

I’ve added type conversion operator for mpreal to int transformation. Please download new version and try it – check if it solves your problem.
Something like this should work fine

mpreal x = "1.5";
int y = x;

I’m trying to use mfprc++ to build a high precision code do a massive computation. I settled everything had the mpfrc++ test work successfully. When try to compile my code I bumbed into this error:
error: conversion from mpfr::mpreal to int is ambiguous

this happen because I’m trying to promote an integer to mpreal. Is there any function does this promotion? I’ll be very thankful for any help

Thank you!
Bassam

To convert double values to mpreal you can use two ways:

1. mpreal d = 2.11;
2. mpreal d = “2.11″; // preferable, since there is no conversion to double

Second way is preferable, since there is no transitive conversion to double. Also numbers way beyond double precision can be assigned, like

mpreal d = “2.1234567891234567891234567″;

Generally you do not need to invoke mpreal::set_double_bits(). It is needed only for specific purposes (read first comment for more information).

Thanks.

I have a couple of questions upon usage howerver. I am trying to assign a double value to an mp real and I get an exception.

mpreal::set_default_prec(128);
mpreal::set_double_bits(32); // I am assuming this is decimal places — please advice

mpreal d = 2.11 ;

terminate called after throwing an instance of ‘mpfr::conversion_overflow’

Is this correct? I would assume that I could assign a double to an mpreal.

http://math.nist.gov/tnt/index.html

It’s like a lighter weight version of Eigen, one more devoted to core linear algebra. Everything is defined in header files (hence no libraries to build) and it uses doxygen documentation. Note: I am using version 3.0.12 from the download page.

Jerry

I have already been using GMP via gmpxx.h. Above mentioned complex C++ wrapper is
based on GMP. Problem here is not so many functions, as you suggest.
Thanks for MPIR. I didn’t know about it. MPACK infrastructure is designed to be easy to
port to a multiple precision library. What I need are four types; “REAL”, “COMPLEX”, “INTEGER” and “LOGICAL”. If someone make a wrapper to MPFR, I can port to MPFR immediately.
I’d like to use MPFR for better calculation evaluation.

Anyway please take your time. Hope I can do some contribution to you.

Best regards,
Nakata Maho

Thank you for your comment!
I really like your ideas of MPACK and high precision optimization solvers.
I’ve checked your web site and I think you are doing very impressive stuff.

MPFR library offers very nice features over GMP, like correct rounding, high level functions, etc. I think it would suit MPACK needs much better than bare GMP.

Besides there are some problems with GMP usage on Windows platform: http://www.gladman.me.uk/. So, if you want MPACK to be used on Windows it is better to consider MPIR: http://www.mpir.org/. MPFR can use it instead of GMP.

C++ interface for GMP is already exist and distributed along with GMP source code (gmpxx.h). I didn’t check it personally, but maybe it worth considering before developing new one.

I have plans to make C++ interface for MPC but I cannot promise exact dates, sorry.

I would be honored if you would use my library MPFR C++ for MPACK. I am open for any questions and ready to provide you assistance on that matter.

Thank you!

I’d like to use it for MPACK (MBLAS/MLAPACK).
http://mplapack.sourceforge.net/
How about wrapping MPC as well?

I prepared general (not very well one) for GMP.
http://mplapack.cvs.sourceforge.net/viewvc/*checkout*/mplapack/mpack/include/mpc_class.h?revision=1.5

any comment is really appreciated.

Thanks!