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.\" RCSid "$Id$" |
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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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rcollate - resize or re-order 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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.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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.B \-f[afdb][N] |
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][ |
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.B \-t |
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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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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. |
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For example, "3x10X7x2" would order output data with a 3x10 super-array of |
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7x2 subblocks. |
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This type of block hierarchy is convenient for visualizing 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, but the |
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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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option may be used to turn this behavior off. |
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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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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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does not actually do anything for binary files unless the data is being |
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re-ordered. |
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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 binary files with no header information, the user must |
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specify at least one input or output 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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be resized or re-ordered as well as transposed. |
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If input and output dimensions are given and there is no block re-ordering, |
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the number of input rows 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 memory. |
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.SH EXAMPLE |
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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 re-ordering operation, regardless of their |
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position on the command line. |
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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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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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For large transpose or re-ordering operations on Unix systems, |
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it is most efficient to specify the input file on the command line, |
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rather than reading 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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.PP |
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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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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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without a transpose or re-ordering, |
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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), tabfunc(1), total(1) |
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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) |
