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Comparing ray/doc/man/man1/icalc.1 (file contents):
Revision 1.2 by greg, Tue Sep 4 17:36:40 2007 UTC vs.
Revision 1.3 by greg, Thu Dec 19 16:38:12 2013 UTC

# Line 13 | Line 13 | is a algebraic calculator designed primarily for
13   interactive use.
14   Each formula definition
15   .I file
16 < is read and compiled.
16 > is read and compiled from the RADIANCE library where it is found.
17   The standard input is then read, expressions are evaluated
18   and results are sent to the standard output.
19   If a newline is escaped using a backslash, input is continued
# Line 129 | Line 129 | inverse trigonometric functions.
129   .TP
130   .BR "atan2(y, x)"
131   inverse tangent of y/x (range \-pi to pi).
132 + .SH ENVIRONMENT
133 + RAYPATH         the directories to check for auxiliary files.
134   .SH AUTHOR
135   Greg Ward
136   .SH "SEE ALSO"

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