1-d roots (error handling)

["Peter S. Christopher" <peterc@midway.uchicago.edu>]

Hi list,

	I'm using brents algorithm to find one dimensional roots, although
I don't think my question is restricted to brents algo. In the multi-root
package, the user defined function can return GSL_FAILURE to indicate to
the solver that a critical error has occurred. Then the solver returns an
appropriate error code. Can this be done with the one-d root
algorithms? The current interface has the 1-d user defined function
returning a double; if I return GSL_NAN from my user defined will the the
solver handle that like a critical error? Should it handle this like a
critical error?

Thanks in advance,
Pete Christopher