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32 .\" @(#)rs.1 8.2 (Berkeley) 12/30/93
40 .Nd reshape a data array
44 .Fl Oo Cm csCS Oc Ns Op Ar x
45 .Oo Cm kKgGw Oc Ns Op Ar N
48 .Op Ar rows Op Ar cols
52 utility reads the standard input, interpreting each line as a row
53 of blank-separated entries in an array,
54 transforms the array according to the options,
55 and writes it on the standard output.
56 With no arguments it transforms stream input into a columnar
57 format convenient for terminal viewing.
59 The shape of the input array is deduced from the number of lines
60 and the number of columns on the first line.
61 If that shape is inconvenient, a more useful one might be
62 obtained by skipping some of the input with the
65 Other options control interpretation of the input columns.
67 The shape of the output array is influenced by the
71 specifications, which should be positive integers.
72 If only one of them is a positive integer,
74 computes a value for the other which will accommodate
76 When necessary, missing data are supplied in a manner
77 specified by the options and surplus data are deleted.
78 There are options to control presentation of the output columns,
79 including transposition of the rows and columns.
81 The following options are available:
82 .Bl -tag -width indent
84 Input columns are delimited by the single character
92 but maximal strings of
96 Output columns are delimited by the single character
104 but padded strings of
108 Fill in the rows of the output array using the columns of the
109 input array, that is, transpose the input while honoring any
115 Print the pure transpose of the input, ignoring any
127 but print the ignored lines.
129 The gutter width (inter-column space), normally 2, is taken to be
134 percent of the maximum column width added to it.
136 Consider each line of input as an array entry.
138 On lines having fewer entries than the first line,
139 use null entries to pad out the line.
140 Normally, missing entries are taken from the next line of input.
142 If there are too few entries to make up the output dimensions,
143 pad the output by recycling the input from the beginning.
144 Normally, the output is padded with blanks.
146 Print the shape of the input array and do nothing else.
147 The shape is just the number of lines and the number of
148 entries on the first line.
152 but also print the length of each line.
154 Right adjust entries within columns.
156 The width of the display, normally 80, is taken to be the positive
160 Do not trim excess delimiters from the ends of the output array.
162 Adapt column widths to fit the largest entries appearing in them.
167 transposes its input, and assumes one array entry per input line
168 unless the first non-ignored line is longer than the display width.
169 Option letters which take numerical arguments interpret a missing
170 number as zero unless otherwise indicated.
174 utility can be used as a filter to convert the stream output
175 of certain programs (e.g.,
184 into a convenient ``window'' format, as in
185 .Bd -literal -offset indent
189 This function has been incorporated into the
191 program, though for most programs with similar output
195 To convert stream input into vector output and back again, use
196 .Bd -literal -offset indent
200 A 10 by 10 array of random numbers from 1 to 100 and
201 its transpose can be generated with
202 .Bd -literal -offset indent
203 % jot \-r 100 | rs 10 10 | tee array | rs \-T > tarray
208 a file consisting of a multi-line vector with 9 elements per line
209 can undergo insertions and deletions,
210 and then be neatly reshaped into 9 columns with
211 .Bd -literal -offset indent
215 Finally, to sort a database by the first line of each 4-line field, try
216 .Bd -literal -offset indent
217 % rs \-eC 0 4 | sort | rs \-c 0 1
227 utility first appeared in
232 Handles only two dimensional arrays.
234 The algorithm currently reads the whole file into memory,
235 so files that do not fit in memory will not be reshaped.
237 Fields cannot be defined yet on character positions.
239 Re-ordering of columns is not yet possible.
241 There are too many options.
243 Multibyte characters are not recognized.
247 (2048) bytes are not processed and result in immediate termination of