A somewhat less elegant version that I wrote for use with MM about 20 years
ago (and haven't bothered to update). The actual code uses real BEL
characters for delimiters, as was the MM style.
.\" ****************************************************************************
.\" FR: FRaction
.\" Usage: .FR <numerator> <denominator>
.\" .FR <numerator> <denominator> <anything>
.\" .FR <anything> <numerator> <denominator> <anything>
.\" ****************************************************************************
.de FR
.ie \\n(.$>3 \{\
\%\&\\$1\^\
\v'-.3m'\s-4\&\\$2\s0\
\v'+.3m'\h'-.05m'\(f/\c
.if ^G\\$3^G4^G \h'-.05m'\c
\s-5\\$3\s0\^\\$4
.\}
.el \{\
\%\&\v'-.3m'\s-4\&\\$1\s0\
\v'+.3m'\h'-.05m'\(f/\c
.if ^G\\$2^G4^G \h'-.05m'\c
\s-4\\$2\s0\
\^\\$3
.\}
..$
It worked well enough, including the diddle for the digit 4 in the
denominator, with the Times Roman and Helvetica fonts that we had available
at the time. I used similar macros for superscripts and subscripts.
Jeff Conrad
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