--- ray/doc/man/man1/icalc.1	2007/09/04 17:36:40	1.2
+++ ray/doc/man/man1/icalc.1	2022/03/11 22:50:13	1.5
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: icalc.1,v 1.2 2007/09/04 17:36:40 greg Exp $"
+.\" RCSid "$Id: icalc.1,v 1.5 2022/03/11 22:50:13 greg Exp $"
 .TH ICALC 1 2/3/95 RADIANCE
 .SH NAME
 icalc - interactive calculator
@@ -13,7 +13,7 @@ is a algebraic calculator designed primarily for
 interactive use.
 Each formula definition
 .I file
-is read and compiled.
+is read and compiled from the RADIANCE library where it is found.
 The standard input is then read, expressions are evaluated
 and results are sent to the standard output.
 If a newline is escaped using a backslash, input is continued
@@ -88,8 +88,8 @@ The following library of predefined functions and vari
 .BR PI
 the ratio of a circle's circumference to its diameter.
 .TP
-.BR "if(cond, then, else)"
-if cond is greater than zero,
+.BR "if(test, then, else)"
+if test is greater than zero,
 then is evaluated, otherwise else is evaluated.
 This function is necessary for recursive definitions.
 .TP
@@ -103,6 +103,12 @@ 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
@@ -129,6 +135,8 @@ inverse trigonometric functions.
 .TP
 .BR "atan2(y, x)"
 inverse tangent of y/x (range \-pi to pi).
+.SH ENVIRONMENT
+RAYPATH		the directories to check for auxiliary files.
 .SH AUTHOR
 Greg Ward
 .SH "SEE ALSO"