Problem with least-squares fitting.

[Tiago de Paula Peixoto <count0 at fissionauthority dot com>]

Hello.

 I'm experiencing a weird error message using the GSL linear least squares
multi-parameter fitting. When I try to fit a function with only one
parameter, such as "y = a * x", I get the following error:

subvector_source.c:28: vector length n must be positive integer
(gsl_error: invalid argument supplied by user)

The fit results seem OK, and I don't know what I'm doing wrong. When I fit
with 2 parameters or more, everything works fine.

I'm sending a small program attached that exemplifies the problem. 

I'm using GSL 1.2.

Thanks for any help.

-- 

    Tiago

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