index in fit

[<pl...@pi...>]

Hi,

I am wanting to run fit on each section of a long, indexed datafile. 
While the symmetry of the syntax between plot and fit means this is 
syntactically possible, it is in fact useless since only the final 
fitted parameters are retained.

A similar problem occurs if I split the data file into separate files 
and use the iteration feature.


help fit states:

  <datafile> is treated as in the `plot` command.  All the `plot datafile`
  modifiers (`using`, `every`,...) except `smooth` and the deprecated `thru`
  are applicable to `fit`. See `plot datafile`.



help plot | datafile :

  Syntax:
        plot '<file_name>' {binary <binary list>}
                           {{nonuniform} matrix}
                           {index <index list> | index "<name>"}
                           {every <every list>}
                           {thru <thru expression>}
                           {using <using list>}
                           {smooth <option>}
                           {volatile} {noautoscale}


One work around would be to try to process the fit log but since there 
are other calls to fit this seems error prone and cumbersome.

 >>
Final set of parameters            Asymptotic Standard Error
=======================            ==========================

Td              = -0.294853        +/- 0.003685     (1.25%)

 >>


A more optimal solution that would take full advantage of what is 
possible in the syntax but seems currently in-exploitable would be if 
the final fit results were stored in an internal array in the variable 
name space for each call to fit.

Thus a call to fit with an iteration or an indexed datafile would 
produce an array of all the fit results (presumably with NaN if the fit 
fails).


regards, Peter.