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<H2><A NAME="SECTION0402421000000000000000"></A>
<A NAME="commands_set_fit"></A><A NAME="commands_show_fit"></A><A NAME="set_fit"></A><A NAME="show_fit"></A>
<BR>
Fit
</H2>
The <B>fit</B> setting defines where the <B>fit</B> command writes its output.
If this option was built into your version of gnuplot, it also controls
whether parameter errors from the fit will be written into variables.
<P>
Syntax:
<BR>
<PRE>
set fit {logfile {"<filename>"}} {{no}errorvariables}
unset fit
show fit
</PRE>
<BR>
<P>
The 4#4filename5#5 argument must be enclosed in single or double quotes.
<P>
If no filename is given or <B>unset fit</B> is used the log file is
reset to its default value <TT>"</TT>fit.log<TT>"</TT> or the value of the environmental
variable <B>FIT_LOG</B>.
<P>
If the given logfile name ends with a / or 2#2, it is interpreted to be
a directory name, and the actual filename will be <TT>"</TT>fit.log<TT>"</TT> in that
directory.
<P>
If the <B>errorvariables</B> option is turned on, the error of each fitted
parameter computed by <B>fit</B> will be copied to a user-defined variable
whose name is formed by appending <TT>"</TT>_err<TT>"</TT> to the name of the parameter
itself. This is useful mainly to put the parameter and its error onto
a plot of the data and the fitted function, for reference, as in:
<P>
<BR>
<PRE>
set fit errorvariables
fit f(x) 'datafile' using 1:2 via a, b
print "error of a is:", a_err
set label 'a=%6.2f', a, '+/- %6.2f', a_err
plot 'datafile' using 1:2, f(x)
</PRE>
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<ADDRESS>
2010-08-17
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