R8COL
Arrays of Columns

R8COL is a C library which contains utility routines for "R8COL" objects, that is, double precision real MxN arrays, considered as N column vectors, each of length M. That is, the data may be thought of as essentially multiple columns, and many operations will be carried out columnwise.

Licensing:

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

Languages:

R8COL is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version and a Python version.

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Source Code:

• r8col.c, the source code;
• r8col.h, the include file.

Examples and Tests:

• r8col_test.c, the calling program;
• r8col_test.txt, the output file.

List of Routines:

• I4_LOG_10 returns the integer part of the logarithm base 10 of an I4.
• I4_MAX returns the maximum of two I4's.
• I4_MIN returns the smaller of two I4's.
• I4_POWER returns the value of I^J.
• I4_UNIFORM_AB returns a scaled pseudorandom I4 between A and B.
• I4VEC_PRINT prints an I4VEC.
• I4VEC_TRANSPOSE_PRINT prints an I4VEC "transposed".
• PERM0_CHECK checks a permutation of (0,...,N-1)
• R8_MAX returns the maximum of two R8's.
• R8_MIN returns the minimum of two R8's.
• R8_UNIFORM_AB returns a pseudorandom R8 scaled to [A,B].
• R8COL_COMPARE compares two columns in an R8COL.
• R8COL_DUPLICATES generates an R8COL with some duplicate columns.
• R8COL_FIND seeks a column value in an R8COL.
• R8COL_FIRST_INDEX indexes the first occurrence of values in an R8COL.
• R8COL_INDICATOR_NEW sets up an "indicator" R8COL.
• R8COL_INSERT inserts a column into an R8COL.
• R8COL_MAX returns the column maximums of an R8COL.
• R8COL_MAX_INDEX returns the indices of column maximums in an R8COL.
• R8COL_MAX_ONE rescales an R8COL so each column maximum is 1.
• R8COL_MEAN returns the column means of an R8COL.
• R8COL_MIN returns the column minimums of an R8COL.
• R8COL_MIN_INDEX returns the indices of column minimums in an R8COL.
• R8COL_NORMALIZE_LI normalizes an R8COL with the column infinity norm.
• R8COL_PART_QUICK_A reorders the columns of an R8COL.
• R8COL_PERMUTE permutes an R8COL in place.
• R8COL_PRINT prints an R8COL.
• R8COL_PRINT_SOME prints some of an R8COL.
• R8COL_REVERSE reverses the order of columns in an R8COL.
• R8COL_SEPARATION returns the "separation" of an R8COL.
• R8COL_SORT_HEAP_A ascending heapsorts an R8COL.
• R8COL_SORT_HEAP_INDEX_A does an indexed heap ascending sort of an R8COL.
• R8COL_SORT_QUICK_A ascending quick sorts an R8COL.
• R8COL_SORTED_TOL_UNDEX returns tolerably unique indexes for a sorted R8COL.
• R8COL_SORTED_TOL_UNIQUE keeps tolerably unique elements in a sorted R8COL.
• R8COL_SORTED_TOL_UNIQUE_COUNT counts tolerably unique elements in a sorted R8COL.
• R8COL_SORTED_UNDEX returns unique indexes for a sorted R8COL.
• R8COL_SORTED_UNIQUE keeps unique elements in a sorted R8COL.
• R8COL_SORTED_UNIQUE_COUNT counts unique elements in a sorted R8COL.
• R8COL_SORTR_A ascending sorts one column of an R8COL, adjusting all entries.
• R8COL_SUM sums the columns of an R8COL.
• R8COL_SWAP swaps columns J1 and J2 of an R8COL.
• R8COL_TO_R8VEC converts an R8COL to an R8VEC.
• R8COL_TOL_UNDEX indexes tolerably unique entries in an R8COL.
• R8COL_TRANSPOSE_PRINT prints an R8COL, transposed.
• R8COL_TRANSPOSE_PRINT_SOME prints some of an R8COL, transposed.
• R8COL_UNIFORM_01_NEW fills an R8COL with pseudorandom values scaled to [0,1].
• R8COL_UNIFORM_AB_NEW returns a scaled pseudorandom R8COL.
• R8COL_UNIFORM_ABVEC_NEW fills an R8COL with scaled pseudorandom numbers.
• R8COL_TOL_UNIQUE_COUNT counts tolerably unique entries in an R8COL.
• R8COL_TOL_UNIQUE_INDEX indexes tolerably unique entries in an R8COL.
• R8COL_UNDEX indexes unique entries in an R8COL.
• R8COL_UNIQUE_COUNT counts unique entries in an R8COL.
• R8COL_UNIQUE_INDEX indexes unique entries in an R8COL.
• R8COL_VARIANCE returns the variances of an R8COL.
• R8VEC_COMPARE compares two R8VEC's.
• R8VEC_EQ is true if two R8VEC's are equal.
• R8VEC_GT == ( A1 > A2 ) for two R8VEC's.
• R8VEC_LT == ( A1 < A2 ) for two R8VEC's.
• R8VEC_PRINT prints an R8VEC.
• R8VEC_SWAP swaps the entries of two R8VEC's.
• SORT_HEAP_EXTERNAL externally sorts a list of items into ascending order.
• TIMESTAMP prints the current YMDHMS date as a time stamp.

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