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<HTML><BODY><PRE></PRE><H2>NAME</H2><PRE>     nodiff - nth order difference program</PRE><H2>SYNOPSIS</H2><PRE>     <STRONG>nodiff</STRONG> <STRONG>[</STRONG> <STRONG>-o</STRONG> <EM>order</EM> ] [ <STRONG>-f</STRONG> <EM>field</EM>_<EM>name</EM> ] [ <STRONG>-r</STRONG> <EM>range</EM>  ]  [   <STRONG>-</STRONG> <STRONG>x</STRONG>     <EM>debug</EM>_<EM>level</EM> ] fea.in fea.out</PRE><H2>DESCRIPTION</H2><PRE>     <EM>Nodiff</EM> is a shell script which finds the  nth-order  differ-     ence  of  field  <EM>field</EM>_<EM>name</EM>  in  the  ESPS <STRONG><A HREF="../man5.html/FEA.5.html">FEA (5-ESPS)</A></STRONG> file     <EM>fea</EM>_<EM>in</EM> and writes the result to  the  output  file  <EM>fea</EM>.<EM>out</EM>.     The  name  of  the  field  in the output file is obtained by     appending one of _<EM>d1</EM>, ..., _<EM>d5</EM> to <EM>field</EM>_<EM>name</EM>,  in  agreement     with <EM>order</EM>.     The first order difference of <EM>field</EM>_<EM>name</EM> is computed element     -  by-element as <EM>field</EM>_<EM>name</EM>[<EM>i</EM>][<EM>recno</EM>] - <EM>field</EM>_<EM>name</EM>[<EM>i</EM>][<EM>recno</EM>-     <EM>1</EM>] for all elements <STRONG>i</STRONG> of the field  <EM>field</EM>_<EM>name</EM>.  The  second     order   difference   is  found  as  <EM>field</EM>_<EM>name</EM>[<EM>i</EM>][<EM>recno</EM>]  -<EM>2</EM>     <EM>field</EM>_<EM>name</EM>[<EM>i</EM>][<EM>recno</EM>-<EM>1</EM>] + <EM>field</EM>_<EM>name</EM>[<EM>i</EM>][<EM>recno</EM>-<EM>2</EM>].     <EM>Nodiff</EM> uses <STRONG><A HREF="../man1.html/tofeasd.1.html">tofeasd (1- ESPS)</A></STRONG>  to  translate  the  specified     field  in  the  input file into a <STRONG><A HREF="../man5.html/FEA_SD.5.html">FEA_SD (5-ESPS)</A></STRONG> file.  The     output of <EM>tofeasd</EM> is piped to <STRONG><A HREF="../man1.html/filter.1.html">filter (1- ESPS)</A></STRONG>,  which  uses     predefined <STRONG><A HREF="../man5.html/FEA_FILT.5.html">FEA_FILT (5-ESPS)</A></STRONG> files to find the correct order     difference.  <STRONG><A HREF="../man1.html/feafunc.1.html">feafunc (1-ESPS)</A></STRONG> is used to give  the  filtered     data  the  correct field name, and <STRONG><A HREF="../man1.html/mergefea.1.html">mergefea (1-ESPS)</A></STRONG> is used     to combine the differenced data with the  original  data  to     form the output records.</PRE><H2>OPTIONS</H2><PRE>     The following options are supported:     <STRONG>-o</STRONG> <EM>order</EM> [1]          determines which order  difference  to  compute;  valid          values  are 1 through 5.  The FEAFILT files <EM>diff1</EM>.<EM>filt</EM>,          ..., <EM>diff5</EM>.<EM>filt</EM> contain the  necessary  filter  coeffi-          cients.    They    are    found    in   the   directory          $ESPS_BASE/lib/filters.     <STRONG>-f</STRONG> <EM>field</EM>_<EM>name</EM> [spec_param]          name of the field whose difference is to be found.     <STRONG>-r</STRONG> <EM>range</EM> [1:last_in_file]          range of records to process.   Default  is  to  process          every  record  in the input file.  The <STRONG>-r</STRONG> option cannot          be used with standard input.     <STRONG>-x</STRONG> <EM>debug</EM>_<EM>level</EM> [0]          If <EM>debug</EM>_<EM>level</EM>  is  positive,  debugging  messages  and          other  information  are  printed  on the standard error          output.  The messages proliferate  as  the  <EM>debug</EM>_<EM>level</EM>          increases.   If <EM>debug</EM>_<EM>level</EM> is 0 (the default), no mes-          sages are printed.</PRE><H2>ESPS PARAMETERS</H2><PRE>     There is no paramter processing.</PRE><H2>ESPS COMMON</H2><PRE>     Common files are not used.</PRE><H2>ESPS HEADERS</H2><PRE>     All header information is copied from input to output. Addi-     tionally, <STRONG><A HREF="../man1.html/filter.1.html">filter (1-ESPS)</A></STRONG> adds information about the differ-     ence filter used.</PRE><H2>BUGS</H2><PRE>     None known.</PRE><H2>SEE ALSO</H2><PRE>     <STRONG><A HREF="../man1.html/copysps.1.html">copysps (1-ESPS)</A></STRONG>, <STRONG><A HREF="../man1.html/tofeasd.1.html">tofeasd (1-ESPS)</A></STRONG>, <STRONG><A HREF="../man1.html/filter.1.html">filter (1-ESPS)</A></STRONG>,     <STRONG><A HREF="../man1.html/feafunc.1.html">feafunc (1-ESPS)</A></STRONG>, <STRONG><A HREF="../man1.html/mergefea.1.html">mergefea (1-ESPS)</A></STRONG>, <STRONG><A HREF="../man5.html/ESPS.5.html">ESPS (5-ESPS)</A></STRONG>,     <STRONG><A HREF="../man5.html/FEA.5.html">FEA (5-ESPS)</A></STRONG>, <STRONG><A HREF="../man5.html/FEA_SD.5.html">FEA_SD (5-ESPS)</A></STRONG></PRE><H2>AUTHOR</H2><PRE>     Program and man page by Bill Byrne.</PRE></BODY></HTML>
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