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<H1><A NAME="SECTION0012180000000000000000"></A>
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4.18 Binary table i/o
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<P>
All <A NAME="tex2html285"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> programs that accept table data input may read ASCII
or binary data. When using binary data the user must be aware
of the fact that <A NAME="tex2html286"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> has no way of determining the actual
number of columns in the file. You should therefore pass that
information to <A NAME="tex2html287"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> via the binary <B>-bi</B>[<B>s</B>]<I>n</I> option,
where <I>n</I> is the actual number of data columns (<B>s</B>
indicates single rather than double precision).
Note that <I>n</I> may be larger than <I>m</I>, the number of
columns that the <A NAME="tex2html288"
HREF="http://www.soest.hawaii.edu/gmt"><B>GMT</B></A> program requires to do its task. If
<I>n</I> is not given then it defaults to <I>m</I>. If
<I>n</I> <IMG
WIDTH="16" HEIGHT="29" ALIGN="MIDDLE" BORDER="0"
SRC="img42.gif"
ALT="$<$"> <I>m</I> an error is generated. For more information,
see Appendix B.
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<ADDRESS>
Paul Wessel
2001-04-18
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