R4LIB
A Single Precision Real Arithmetic Utility Library

R4LIB is a Python library which contains a number of utilities for single precision real (R4) arithmetic.

Licensing:

The computer code and data files made available on this web page are distributed under the GNU LGPL license.

Languages:

R4LIB is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

Related Programs:

C4LIB, a Python library which contains many utility routines, using "C4" or "single precision complex" arithmetic.

C8LIB, a Python library which contains many utility routines, using "C8" or "double precision complex" arithmetic.

I4LIB, a PYTHON library which contains many utility routines, using "I4" or "single precision integer" arithmetic.

R8LIB, a Python library which contains many utility routines, using "R8" or "double precision real" arithmetic.

UNIFORM, a Python library which contains uniform random number generators (RNG's) for several arithmetic types.

References:

1. Thomas Cormen, Charles Leiserson, Ronald Rivest,
   Introduction to Algorithms,
   MIT Press, 2001,
   ISBN: 0262032937,
   LC: QA76.C662.
2. Albert Nijenhuis, Herbert Wilf,
   Combinatorial Algorithms for Computers and Calculators,
   Second Edition,
   Academic Press, 1978,
   ISBN: 0-12-519260-6,
   LC: QA164.N54.

Source Code:

• r4_exp.py, evaluates the exponential function, while avoiding underflow and overflow.
• r4mat_print.py, prints an R4MAT.
• r4mat_print_some.py, prints some of an R4MAT.
• r4_uniform_01.py, returns a unit pseudorandom R4.
• r4_uniform_ab.py, returns a scaled pseudorandom R4.
• r4mat_print.py, prints an R4MAT.
• r4mat_print_some.py, prints some of an R4MAT.
• r4mat_uniform_ab.py, returns a scaled pseudorandom R4MAT.
• r4mat_uniform_01.py, returns a unit pseudorandom R4MAT.
• r8vec_covariance.py, computes the sample covariance of two sets of vector data.
• r4vec_print.py, prints an R4VEC.
• r4vec_uniform_01.py, returns a unit pseudorandom R4VEC.
• r4vec_uniform_ab.py, returns a scaled pseudorandom R4VEC.
• timestamp.py, prints the current YMDHMS date as a timestamp.

Examples and Tests:

• r4lib_test.py, a program that calls all the tests.
• r4lib_test.sh, a BASH shell script that executes the test program.
• r4lib_test.txt, the output file.

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