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.\" RCSid "$Id: rcollate.1,v 1.9 2019/11/08 02:10:38 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[io]
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][
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.B \-w
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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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.B "\-o RxC[xR1xC2..]"
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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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The number of rows may be specified with a
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.I \-or
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option, or may be determined automatically from the size of the input if
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it is an even multiple of the number of columns (as it should be).
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Alternatively, both may be specified using a
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.I \-o
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option with the number of rows and columns separated by an 'x', as in "30x14"
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for 30 rows by 14 columns.
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.I Rcollate
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can also reorder the input into nested blocks by continuing the output size
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string, "3x10X7x2" would order output data with a 3x10 super-array of 7x2
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subblocks.
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This is a convenient way to visualize tensor data.
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.PP
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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.
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The
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.I \-hi
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option may be used to turn off the expectation of a header on input.
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The
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.I \-ho
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option turns off header output, and
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.I \-h
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by itself turns off both input and output headers.
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The
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.I \-w
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option turns off non-fatal warning messages, such as unexpected EOD.
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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 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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option is given, also.
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.PP
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If an input header is present, it may contain the format, number of components
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and matrix dimensions.
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In such cases, the
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.I \-ic,
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.I \-ir
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and
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.I \-f
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options are not required, but will be checked against the header
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information if provided.
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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 total 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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For large transpose operations on Unix systems, it is most 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 virtual memory.
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If the
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.I \-o
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option is also given with multiple block levels, the transpose operation
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will logically precede the reblocking operation.
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.SH EXAMPLES
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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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.PP
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To create an appropriate header for a binary float matrix as required by
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.I rmtxop(1)\:
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.IP "" .2i
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rcollate -hi -ff3 -or 145 -oc 8760 input.smx | rmtxop dcoef.dmx - > res.txt
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.PP
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To visualize a Shirley-Chiu BTDF matrix where the interior resolution is
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64x64 and the exterior resolution is 32x32:
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.IP "" .2i
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rcollate -o 64x64X32x32 s-c_bsdf.mtx | rmtxop -fc - > s-c_bsdf.hdr
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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 amount of white space between 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 on output.
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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 its standard output.
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.SH "SEE ALSO"
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cnt(1), histo(1), neaten(1), rcalc(1), rlam(1), rmtxop(1),
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rsplit(1), tabfunc(1), total(1)
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