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<H3><A NAME="SECTION0402416300000000000000"></A>
<A NAME="set_datafile_missing"></A><A NAME="show_datafile_missing"></A><A NAME="set_missing"></A><A NAME="missing"></A><A NAME="4379"></A>
<BR>
Set datafile missing
</H3>
The <B>set datafile missing</B> command allows you to tell <B>gnuplot</B> what character
string is used in a data file to denote missing data. Exactly how this missing
value will be treated depends on the <B>using</B> specifier of the <B>plot</B> or <B>splot</B>
command.
<P>
Syntax:
<BR>
<PRE>
set datafile missing {"<string>"}
show datafile missing
unset datafile
</PRE>
<BR>
<P>
Example:
<BR>
<PRE>
# Ignore entries containing IEEE NaN ("Not a Number") code
set datafile missing "NaN"
</PRE>
<BR>
<P>
Example:
<BR>
<PRE>
set style data linespoints
plot '-'
1 10
2 20
3 ?
4 40
5 50
e
set datafile missing "?"
plot '-'
1 10
2 20
3 ?
4 40
5 50
e
plot '-' using 1:2
1 10
2 20
3 ?
4 40
5 50
e
plot '-' using 1:($2)
1 10
2 20
3 ?
4 40
5 50
e
</PRE>
<BR>
<P>
The first <B>plot</B> will recognize only the first datum in the <TT>"</TT>3 ?<TT>"</TT> line. It
will use the single-datum-on-a-line convention that the line number is <TT>"</TT>x<TT>"</TT>
and the datum is <TT>"</TT>y<TT>"</TT>, so the point will be plotted (in this case erroneously)
at (2,3).
<P>
The second and third <B>plot</B> commands will correctly ignore the middle line.
The plotted line will connect the points at (2,20) and (4,40).
<P>
The fourth <B>plot</B> will also correctly ignore the middle line, but the plotted
line will not connect the points at (2,20) and (4,40).
<P>
There is no default character for <B>missing</B>, but in many cases any
non-parsible string of characters found where a numerical value is expected
will be treated as missing data.
<P>
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<ADDRESS>
2010-08-17
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