Re: [Help-gsl] UNDERFLOW error

[Francesco Petrogalli]

Hi again,
using the "mask-underflow" environment setup I managed to torn off the
underflow error, but know for the same input values the code
terminates with the error message "Floating point exception"

I tried to get rid of it with "mask-all" and other setup keywords, but
it is not working.

Any idea?


Thanks,

franZ

PS I am working on Ubuntu 10.04 with GSL 1.13

2011/11/19 Liam Healy <address@hidden>:
> See
> http://www.gnu.org/s/gsl/manual/html_node/Setting-up-your-IEEE-environment.html
>
> I think you want mask-underflow; see "adjusted combination of modes" example
> on that page.  You're right, it should be the default, and it's always been
> the default on systems I've used; I'm not sure why you have a different IEEE
> mode by default.
>
> Liam
>
> On Fri, Nov 18, 2011 at 9:04 PM, Francesco Petrogalli
> <address@hidden> wrote:
>>
>> Hi,
>> I am using the function gsl_sf_taylorcoeff in my code, which return
>> the value {x^n\over n!} for real x>=0 and  integer n>=0.
>>
>> For  small values of  x (\approx 10e-15) the default error handler of
>> gsl is aborting my code with an underflow error.
>> Probably a better algorithm in my code would not produce such problem,
>> but I wonder why the underflow error is not "fixed" just returning 0.0
>> as value of the function.
>> Shouldn't this be a reasonable approach to underflow problems of this
>> function? (If not, what am I missing?...)
>>
>> Best,
>>
>> franZ
>>
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>
>