Hi,
you can test exp(a) and/or exp(b) using gsl_isnan, gsl_isinf or gsl_finite
functions. See the GSL manual for more information.
[[]]
Ralph.
On 6/18/06, A J <address@hidden> wrote:
> Hey All:
While trying to use gsl_sf_exp_e10_e, I get the following error:
gsl: exp.c:127: ERROR: overflow
Default GSL error handler invoked.
Aborted
In my application, I have two numbers a and b and I have to compute a
quantity that's exp(a)/(exp(a)+exp(b)). Now if exp(a) overflows and exp(b)
is in range, I can interpret this as 1. Similarly, if exp(b) overflows and
exp(a) is in range, I can interpret this as 0. Similar interpretations
could be derived for the case in which there's an underflow.
Therefore, it would be nice if I can figure a way in which instead of
throwing an error, the program outputs an alternative integer which could
be
0 if there's neither underflow or overflow, 1 if there's an overflow and 2
if there's an underflow (however I am not sure what I can do when both
overflow or both underflow). Does anyone know how to do this?
Thanks,
A
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Ralph dos Santos Silva
address@hidden
http://dme.ufrj.br/~ralph <http://dme.ufrj.br/%7Eralph>
Departamento de Métodos Estatísticos - DME
Instituto de Matemática - IM
Universidade Federal do Rio de Janeiro - UFRJ
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