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.\" RCSid "$Id: rlam.1,v 1.7 2010/06/18 21:22:49 greg Exp $"
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.TH RCOLLATE 1 7/8/97 RADIANCE
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.SH NAME
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rcollate - resize or transpose matrix data
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.SH SYNOPSIS
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.B rcollate
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[
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.B \-h
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][
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.B \-f[afdb][N]]
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][
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.B \-t
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][
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.B "\-ic in_col"
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][
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.B "\-ir in_row"
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][
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.B "\-oc out_col"
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][
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.B "\-or out_row"
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]
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[
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.B input.dat
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]
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.SH DESCRIPTION
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.I Rcollate
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reads in a single matrix file (table) and reshapes it to have
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the number of columns specified by the
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.I \-oc
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option.
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By default, the file is assumed to include an information header, which
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is copied to the standard output along with the command name, but the
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.I \-h
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option may be used to turn this behavior off.
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.PP
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The input format is assumed to be ASCII, with three white-space separated words
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(typically numbers) in each record.
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A different input format may be specified with the
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.I \-f
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option.
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The suboptions are
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.I \-fa,
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.I \-ff,
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.I \-fd,
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and
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.I \-fb
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for ASCII, float, double, and binary, respectively.
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An optional count may be attached to specify the number of data elements per
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record, which defaults to 1.
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Thus, the default setting is
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.I \-fa3.
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Since
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.I rcollate
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does not interpret the fields, all binary options of the same
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length have the same result.
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On most architectures,
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.I \-ff6,
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.I \-fd3,
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and
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.I \-fb24
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would all be equivalent.
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Note also that the lack of row separators in binary files means that
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.I rcollate
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does not actually do anything for binary files unless the transpose
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.I \(\-t\)
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option is given, also.
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.PP
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The transpose option,
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.I \-t
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swaps rows and columns on the input.
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For binary files, the user must specify at least one input or output
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dimension to define the matrix size.
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For ASCII files,
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.I rcollate
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will automatically determine the number of columns based on the
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position of the first EOL (end-of-line) character, and the number
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of rows based on the count of records in the file.
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The user may override these determinations, allowing the matrix to
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be resized as well as transposed.
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If input and output dimensions are given, the number of input rows
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must equal the number of output columns,
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and the number of input columns must equal the number of output rows
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with the
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.I \-t
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option.
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For large transpose operations on Unix systems, it is much more efficient
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to specify the input file on the command line, rather than reading
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from the standard input, since
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.I rcollate
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can map the file directly into memory.
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.SH EXAMPLE
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To change put 8760 color triplets per row in a matrix with no header:
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.IP "" .2i
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rcollate -h \-oc 8760 input.dat > col8760.dat
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.PP
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To transpose a binary file with 145 float triplets per input row:
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.IP "" .2i
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rcollate -ff3 -ic 145 -t orig.flt > transpose.flt
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.SH AUTHOR
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Greg Ward
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.SH NOTES
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The
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.I rcollate
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command is rather inflexible when it comes to output field and record
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separators for ASCII data.
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It accepts any number or type of white space between input fields
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on input, but only produces spaces as field separators
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between words and tabs as record separators.
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Output row separtors will always be an EOL, which may differ between systems.
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.PP
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If no options are given on the command line, or a binary file is specified
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without a transpose,
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.I rcollate
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issues a warning and simply copies its input to the standard output.
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.SH "SEE ALSO"
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cnt(1), histo(1), neaten(1), rcalc(1), rlam(1), tabfunc(1), total(1)
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