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[Help-gsl] fitting example

From: Petr Ent
Subject: [Help-gsl] fitting example
Date: Tue, 18 Jul 2006 20:48:39 +0200 (CEST)

i have next (hopefully last :-) ) question about non-linear fitting example. 
int expb_f (const gsl_vector * x, void *data,  gsl_vector * f)
"this function should store the vector result f(x,params) in f for argument x 
and arbitrary parameters params"

i understand it that you should compute the value of your function to be fitted 
with current results (x vector) and store it to vector f. but in this example, 
you do that + substract "real value" (y_i) from it and divide it by deviation 

gsl_vector_set (f, i, (Yi - y[i])/sigma[i]);

why do you do that? and what if you dont know deviation of data to be fitted?

thanks for answering
Petr Ent

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