| 9 |
|
][ |
| 10 |
|
.B \-l |
| 11 |
|
][ |
| 12 |
< |
.B \-p |
| 12 |
> |
.B "\-p | \-P" |
| 13 |
|
][ |
| 14 |
|
.B \-n |
| 15 |
|
][ |
| 23 |
|
][ |
| 24 |
|
.B "\-o format" |
| 25 |
|
][ |
| 26 |
+ |
.B "\-in M" |
| 27 |
+ |
][ |
| 28 |
+ |
.B "\-on M" |
| 29 |
+ |
][ |
| 30 |
|
.B "\-f source" |
| 31 |
|
][ |
| 32 |
|
.B "\-e expr" |
| 87 |
|
.I \-p |
| 88 |
|
option specifies "passive mode," where characters that do not |
| 89 |
|
match the input format are passed unaltered to the output. |
| 90 |
< |
This option has no effect unless |
| 90 |
> |
If the |
| 91 |
> |
.I \-P |
| 92 |
> |
option is given instead, then valid input records that do not |
| 93 |
> |
yield a positive |
| 94 |
> |
.I cond |
| 95 |
> |
value are similarly passed to the output. |
| 96 |
> |
(See paragraph below.)\0 |
| 97 |
> |
These options options require that the |
| 98 |
|
.I \-i |
| 99 |
< |
is also specified, and does not make much sense unless |
| 99 |
> |
input format and |
| 100 |
|
.I \-o |
| 101 |
< |
is also given. |
| 101 |
> |
output format also be present. |
| 102 |
|
With both input and output formats, the passive mode can |
| 103 |
|
effectively substitute information in the middle of a file |
| 104 |
|
or stream without affecting the rest of the data. |
| 105 |
|
.PP |
| 106 |
+ |
If a |
| 107 |
+ |
.I \-in |
| 108 |
+ |
option is given with a positive integer argument, |
| 109 |
+ |
.I rcalc |
| 110 |
+ |
will stop processing input once it has loaded this number of records. |
| 111 |
+ |
Similarly, if a |
| 112 |
+ |
.I \-on |
| 113 |
+ |
option is present, |
| 114 |
+ |
.I rcalc |
| 115 |
+ |
will stop after producing this many records, which may be a smaller |
| 116 |
+ |
number if the |
| 117 |
+ |
.I cond |
| 118 |
+ |
variable is used. |
| 119 |
+ |
If multiple input files are given, these counts are continuous over |
| 120 |
+ |
the input and do not reset on each file. |
| 121 |
+ |
.PP |
| 122 |
|
The variable and function definitions in each |
| 123 |
|
.I \-f source |
| 124 |
< |
file are read and compiled. |
| 124 |
> |
file are read and compiled from the RADIANCE library where it is found. |
| 125 |
|
The |
| 126 |
|
.I \-e expr |
| 127 |
|
option can be used to define variables on the command line. |
| 229 |
|
.PP |
| 230 |
|
+ - * / ^ |
| 231 |
|
.PP |
| 232 |
< |
Operators are evaluated left to right. |
| 232 |
> |
Operators are evaluated left to right, except '^', |
| 233 |
> |
which is right associative. |
| 234 |
|
Powers have the highest precedence; multiplication and |
| 235 |
|
division are evaluated before addition and subtraction. |
| 236 |
|
Expressions can be grouped with parentheses. |
| 257 |
|
is positive, output is produced. |
| 258 |
|
If |
| 259 |
|
.I cond |
| 260 |
< |
is less than or equal to zero, the record is skipped and no other expressions |
| 260 |
> |
is less than or equal to zero, the record is skipped (or passed to the |
| 261 |
> |
output if |
| 262 |
> |
.I \-P |
| 263 |
> |
is specified) and no other expressions |
| 264 |
|
are evaluated. |
| 265 |
|
This provides a convenient method for avoiding inappropriate calculations. |
| 266 |
|
The following library of pre-defined functions and variables is provided: |
| 267 |
|
.TP 10n |
| 268 |
+ |
.BR $N |
| 269 |
+ |
Return the value for input column |
| 270 |
+ |
.I N. |
| 271 |
+ |
If an input format is given, using a channel number generates an error. |
| 272 |
+ |
.TP |
| 273 |
|
.BR "in(n)" |
| 274 |
|
Return the value for input column |
| 275 |
|
.I n, |
| 280 |
|
the $N notation, and is more flexible since it is programmable. |
| 281 |
|
This function is disabled if an input format is used. |
| 282 |
|
.TP |
| 283 |
< |
.BR "if(cond, then, else)" |
| 284 |
< |
if cond is greater than zero, |
| 283 |
> |
.BR "if(test, then, else)" |
| 284 |
> |
if test is greater than zero, |
| 285 |
|
then is evaluated, otherwise else is evaluated. |
| 286 |
|
This function is necessary for recursive definitions. |
| 287 |
|
.TP |
| 295 |
|
.BR "rand(x)" |
| 296 |
|
compute a random number between 0 and 1 based on x. |
| 297 |
|
.TP |
| 298 |
+ |
.BR "min(a1, a2, ..)" |
| 299 |
+ |
return the minimum value from a list of arguments. |
| 300 |
+ |
.TP |
| 301 |
+ |
.BR "max(a1, a2, ..)" |
| 302 |
+ |
return the maximum value from a list of arguments. |
| 303 |
+ |
.TP |
| 304 |
|
.BR "floor(x)" |
| 305 |
|
return largest integer not greater than x. |
| 306 |
|
.TP |
| 340 |
|
To print the square root of column two in column one, |
| 341 |
|
and column one times column three in column two: |
| 342 |
|
.IP "" .2i |
| 343 |
< |
rcalc \-e '$1=sqrt($2);$2=$1*$3' inputfile > outputfile |
| 343 |
> |
rcalc -e '$1=sqrt($2);$2=$1*$3' inputfile > outputfile |
| 344 |
> |
.SH ENVIRONMENT |
| 345 |
> |
RAYPATH the directories to check for auxiliary files. |
| 346 |
|
.SH AUTHOR |
| 347 |
|
Greg Ward |
| 348 |
|
.SH BUGS |
| 352 |
|
.PP |
| 353 |
|
Tabs count as single spaces inside fields. |
| 354 |
|
.SH "SEE ALSO" |
| 355 |
< |
cnt(1), ev(1), getinfo(1), icalc(1), rlam(1), tabfunc(1), total(1) |
| 355 |
> |
cnt(1), ev(1), getinfo(1), icalc(1), rcollate(1), rlam(1), |
| 356 |
> |
rsplit(1), tabfunc(1), total(1) |
