Re: [Help-gsl] why disable range checking ? Re: Help-gsl Digest, Vol 81, Issue 10

[glide creme]

Compiling with optimization flags, made it work.

gcc gslRangeCheck.c -lgsl -lgslcblas -O1  -DHAVE_INLINE -DGSL_RANGE_CHECK_OFF

This might need clarification on the website,
http://www.gnu.org/software/gsl/manual/html_node/Accessing-vector-elements.html
,
that optimization must be enabled.

Thanks for your help


On Mon, Aug 23, 2010 at 10:50 PM, Brian Gough <address@hidden> wrote:
> At Thu, 12 Aug 2010 03:20:55 +0200,
> glide creme wrote:
>>
>> On Tue, Aug 10, 2010 at 10:31 PM, Brian Gough <address@hidden> wrote:
>> > At Mon, 9 Aug 2010 18:45:10 +0200,
>> > glide creme wrote:
>> >>
>> >> Yes, i wanted to do this, because of speed issues.
>> >>
>> >> But it would seem from the lack of responses,
>> >> that it might not be possible afterall to disable the range checking.
>> >>
>> >
>> > It is possible, and is tested in the test suite.
>> >
>> > Maybe your header file is from an older version which used a different
>> > macro.
>> >
>>
>> Hi thanks for your reply,
>>
>> Can you specify which testsuite that is?
>> I ran 'make check' and everything seems to be working
>>
>> It says '1 test passed' 42 times, and twice it says 'All 2 tests passed'
>>
>> I'm using the gsl version 1.14, and I installed it using the make utility,
>> No other version of gsl has been previously installed on this computer.
>>
>>
>> My sourcecode which is taken directly from
>> http://www.gnu.org/software/gsl/manual/html_node/Example-programs-for-vectors.html
>> looks like.
>>
>> //file start
>> #define GSL_RANGE_CHECK_OFF
>>
>> #include <stdio.h>
>>      #include <gsl/gsl_vector.h>
>>
>>      int
>>      main (void)
>>      {
>>        int i;
>>        gsl_vector * v = gsl_vector_alloc (3);
>>
>>        for (i = 0; i < 3; i++)
>>          {
>>            gsl_vector_set (v, i, 1.23 + i);
>>          }
>>
>>        for (i = 0; i < 100; i++) /* OUT OF RANGE ERROR */
>>          {
>>            printf ("v_%d = %g\n", i, gsl_vector_get (v, i));
>>          }
>>
>>        gsl_vector_free (v);
>>        return 0;
>>      }
>> //fileend
>>
>>
>> When I have GSL_RANGE_CHECK_OFF in the file, the compiler complains if
>> I  also supply the -DGSL_RANGE_CHECK=0 in the command line.
>>
>>
>> gcc -lgsl gslRangeCheck.c -lgslcblas -DGSL_RANGE_CHECK=0
>> In file included from /usr/include/gsl/gsl_vector_complex_long_double.h:27,
>>                  from /usr/include/gsl/gsl_vector.h:4,
>>                  from gslRangeCheck.c:4:
>> /usr/include/gsl/gsl_check_range.h:47:4: error: #error "cannot set
>> both GSL_RANGE_CHECK and GSL_RANGE_CHECK_OFF"
>>
>
> Since inline functions are not enabled (-DHAVE_INLINE -O2) the call
> goes to the static version of the function where range checking is
> controlled by the global variable gsl_check_range.  It's described
> shortly after the section about GSL_RANGE_CHECK_OFF.
>
> --
> Brian Gough
>
>