RosettaCodeData/Task/Biorhythms/Red/biorhythms.red

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Red [
Title: "Biorythms"
Source: https://rosettacode.org/wiki/Biorhythms#Red
Purpose: "Calculates biorythmic values for given birthday and target date"
]
biorythms: function [
"Calculates biorythmic values for given birthday and target date"
bday [date!]
target [date!]
][
cycles: [
"Physical day " 23
"Emotional day " 28
"Mental day " 33
]
quadrants: [
["(up and rising" "peak"]
["(up but falling" "transition"]
["(down and falling" "valley"]
["(down but rising" "transition"]
]
days: target - bday
print [
#"^(line)"
"Birthday :" bday #"^(line)"
"Target date:" target #"^(line)"
"Days :" days "days"
]
foreach [cycle len] cycles [
posn: days % len
quadrant: to-integer ((posn / len * 4) + 1)
ampl: to-percent round/to sin (days / len * 2 * pi) 0.01
trend: quadrants/(quadrant)
case [
ampl > 0.95 [desc: " Peak"]
ampl < -0.95 [desc: " Valley"]
(absolute ampl) <= 0.05 [desc: " Critical transition"]
true [
t: to-integer (quadrant / 4 * len) - posn
desc: reduce [pad/left ampl 4 trend/(1) ", next" trend/(2) "in" t "days)"]
]
]
print [cycle pad/left reduce [posn "of" len] 8 ":" desc]
]
]
biorythms 1943-03-09 1972-07-11 ; Bobby Fisher won the World Chess Championship
biorythms 1987-05-22 2023-01-29 ; Novak Đoković won the Australian Open for the 11th time
biorythms 1969-01-03 2013-09-13 ; Michael Schuhmacher's bad skiing accident