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lines 542-609 of file: test_more/compare_c/det_by_minor.c
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{xrst_begin time_det_by_minor_c app}

Determine Amount of Time to Execute det_by_minor
################################################

Syntax
******
*time* = ``time_test`` ( *size* , *time_min* )

Purpose
*******
reports the amount of wall clock time for ``det_by_minor``
to compute the determinant of a square matrix.

The *size* has prototype

   ``size_t`` *size*

It specifies the number of rows (and columns) in the square matrix
that the determinant is being calculated for.

time_min
********
The argument *time_min* has prototype

   ``double`` *time_min*

It specifies the minimum amount of time in seconds
that the *test* routine should take.
The calculations is repeated the necessary number of times so that
this amount of execution time (or more) is reached.

time
****
The return value *time* has prototype

   ``double`` *time*

and is the number of wall clock seconds that it took for
``det_by_minor`` to compute its determinant
(plus overhead which includes choosing a random matrix).

Source Code
***********
{xrst_spell_off}
{xrst_code cpp} */
double time_det_by_minor(size_t size, double time_min)
{  size_t repeat;
   double s0, s1, time;
   repeat = 0;
   s0     = elapsed_seconds();
   s1     = s0;
   while( s1 - s0 < time_min )
   {  if( repeat == 0 )
         repeat = 1;
      else
         repeat = 2 * repeat;
      s0     = elapsed_seconds();
      repeat_det_by_minor(repeat, size);
      s1     = elapsed_seconds();
   }
   time = (s1 - s0) / (double) repeat;
   return time;
}
/* {xrst_code}
{xrst_spell_on}

{xrst_end time_det_by_minor_c}