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.\" RCSid "$Id" |
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.\" RCSid "$Id$" |
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.TH RCALC 1 4/6/99 RADIANCE |
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.SH NAME |
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rcalc - record calculator |
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][ |
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.B \-l |
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][ |
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.B \-p |
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][ |
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.B \-n |
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][ |
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.B \-w |
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option may be followed immediately by a 'd' or an 'f' and an optional |
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count, which defaults to 1, indicating the number of double or float |
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binary values to read per record on the input file. |
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If the input is byte-swapped, the |
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.I \-iD |
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or |
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.I \-iF |
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options may be substituted. |
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If binary input is specified, no format string or file is needed. |
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.PP |
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A |
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.I \-of |
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options do not require a count, as this will be determined by the |
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number of output channels in the given expressions. |
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If byte-swapped output is desired, the |
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.I \-oD |
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or |
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.I \-oF |
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options may be substituted. |
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.PP |
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The |
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.I \-p |
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option specifies "passive mode," where characters that do not |
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match the input format are passed unaltered to the output. |
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This option has no effect unless |
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.I \-i |
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is also specified, and does not make much sense unless |
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.I \-o |
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is also given. |
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With both input and output formats, the passive mode can |
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effectively substitute information in the middle of a file |
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or stream without affecting the rest of the data. |
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.PP |
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The variable and function definitions in each |
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.I \-f source |
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file are read and compiled. |
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.PP |
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+ - * / ^ |
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.PP |
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Operators are evaluated left to right. |
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Operators are evaluated left to right, except '^', |
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which is right associative. |
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Powers have the highest precedence; multiplication and |
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division are evaluated before addition and subtraction. |
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Expressions can be grouped with parentheses. |
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This provides a convenient method for avoiding inappropriate calculations. |
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The following library of pre-defined functions and variables is provided: |
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.TP 10n |
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.BR \$N |
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Return the value for input column |
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.I N. |
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If an input format is given, using a channel number generates an error. |
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.TP |
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.BR "in(n)" |
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Return the value for input column |
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.I n, |
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or the number of columns available in this record if |
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.I n |
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is 0. |
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This is an alternate way to get a column value instead of using |
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the $N notation, and is more flexible since it is programmable. |
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This function is disabled if an input format is used. |
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.TP |
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.BR "if(cond, then, else)" |
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if cond is greater than zero, |
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then is evaluated, otherwise else is evaluated. |
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inverse trigonometric functions. |
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.TP |
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.BR "atan2(y, x)" |
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inverse tangent of y/x (range -pi to pi). |
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inverse tangent of y/x (range \-pi to pi). |
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.SH EXAMPLE |
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To print the square root of column two in column one, |
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and column one times column three in column two: |
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.IP "" .2i |
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rcalc -e '$1=sqrt($2);$2=$1*$3' inputfile > outputfile |
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rcalc \-e '$1=sqrt($2);$2=$1*$3' inputfile > outputfile |
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.SH AUTHOR |
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Greg Ward |
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.SH BUGS |
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.PP |
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Tabs count as single spaces inside fields. |
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.SH "SEE ALSO" |
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calc(1), cnt(1), ev(1), getinfo(1), lam(1), tabfunc(1), total(1) |
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cnt(1), ev(1), getinfo(1), icalc(1), rcollate(1), rlam(1), tabfunc(1), total(1) |
