--- ray/doc/man/man1/rcalc.1	2006/12/23 17:27:45	1.7
+++ ray/doc/man/man1/rcalc.1	2019/06/10 13:56:52	1.14
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: rcalc.1,v 1.7 2006/12/23 17:27:45 greg Exp $"
+.\" RCSid "$Id: rcalc.1,v 1.14 2019/06/10 13:56:52 greg Exp $"
 .TH RCALC 1 4/6/99 RADIANCE
 .SH NAME
 rcalc - record calculator
@@ -23,6 +23,10 @@ rcalc - record calculator
 ][
 .B "\-o format"
 ][
+.B "\-in M"
+][
+.B "\-on M"
+][
 .B "\-f source"
 ][
 .B "\-e expr"
@@ -92,9 +96,25 @@ With both input and output formats, the passive mode c
 effectively substitute information in the middle of a file
 or stream without affecting the rest of the data.
 .PP
+If a
+.I \-in
+option is given with a positive integer argument,
+.I rcalc
+will stop processing input once it has loaded this number of records.
+Similarly, if a
+.I \-on
+option is present,
+.I rcalc
+will stop after producing this many records, which may be a smaller
+number if the
+.I cond
+variable is used.
+If multiple input files are given, these counts are continuous over
+the input and do not reset on each file.
+.PP
 The variable and function definitions in each
 .I \-f source
-file are read and compiled.
+file are read and compiled from the RADIANCE library where it is found.
 The
 .I \-e expr
 option can be used to define variables on the command line.
@@ -202,7 +222,8 @@ and the following operators:
 .PP
 	+  -  *  /  ^
 .PP
-Operators are evaluated left to right.
+Operators are evaluated left to right, except '^',
+which is right associative.
 Powers have the highest precedence; multiplication and
 division are evaluated before addition and subtraction.
 Expressions can be grouped with parentheses.
@@ -234,6 +255,11 @@ are evaluated.
 This provides a convenient method for avoiding inappropriate calculations.
 The following library of pre-defined functions and variables is provided:
 .TP 10n
+.BR $N
+Return the value for input column
+.I N.
+If an input format is given, using a channel number generates an error.
+.TP
 .BR "in(n)"
 Return the value for input column
 .I n,
@@ -259,6 +285,12 @@ is zero, the number of available arguments is returned
 .BR "rand(x)"
 compute a random number between 0 and 1 based on x.
 .TP
+.BR "min(a1, a2, ..)"
+return the minimum value from a list of arguments.
+.TP
+.BR "max(a1, a2, ..)"
+return the maximum value from a list of arguments.
+.TP
 .BR "floor(x)"
 return largest integer not greater than x.
 .TP
@@ -293,12 +325,14 @@ trigonometric functions.
 inverse trigonometric functions.
 .TP
 .BR "atan2(y, x)"
-inverse tangent of y/x (range -pi to pi).
+inverse tangent of y/x (range \-pi to pi).
 .SH EXAMPLE
 To print the square root of column two in column one,
 and column one times column three in column two:
 .IP "" .2i
-rcalc -e '$1=sqrt($2);$2=$1*$3' inputfile > outputfile
+rcalc \-e '$1=sqrt($2);$2=$1*$3' inputfile > outputfile
+.SH ENVIRONMENT
+RAYPATH		the directories to check for auxiliary files.
 .SH AUTHOR
 Greg Ward
 .SH BUGS
@@ -308,4 +342,4 @@ options, not in definitions.
 .PP
 Tabs count as single spaces inside fields.
 .SH "SEE ALSO"
-cnt(1), ev(1), getinfo(1), icalc(1), rlam(1), tabfunc(1), total(1)
+cnt(1), ev(1), getinfo(1), icalc(1), rcollate(1), rlam(1), tabfunc(1), total(1)