#!/bin/bash

# R.P. Clark : 02APR2004
#
# Takes three args
# $1 y - the multiplier for phi
# $2 phi
# $3 e

# returns (1 + phi.y) / e, which is
# a value of d to use.

echo " ( 1 + ( $1 * $2 ) ) / $3 + 0.5" | bc  | sed 's/\..*//'