--- ray/doc/man/man1/rcalc.1	2007/09/04 17:36:41	1.8
+++ ray/doc/man/man1/rcalc.1	2013/12/19 16:38:12	1.11
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: rcalc.1,v 1.8 2007/09/04 17:36:41 greg Exp $"
+.\" RCSid "$Id: rcalc.1,v 1.11 2013/12/19 16:38:12 greg Exp $"
 .TH RCALC 1 4/6/99 RADIANCE
 .SH NAME
 rcalc - record calculator
@@ -94,7 +94,7 @@ or stream without affecting the rest of the data.
 .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 +202,8 @@ 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 +235,11 @@ 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,
@@ -299,6 +305,8 @@ 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
+.SH ENVIRONMENT
+RAYPATH		the directories to check for auxiliary files.
 .SH AUTHOR
 Greg Ward
 .SH BUGS
@@ -308,4 +316,4 @@ 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)