Biorhythm Calculator

[matalog]

To check your biorhythm levels(complete pseudo-science, but the graph seems interesting), on HP Prime:

Use the function app and plot 3 plots. Red(Physical): Sin((2*pi*X)/23), Blue(Emotional): ((2*pi*X)/28), and Green(Intellectual): Sin((2*pi*X)/33.

Go to Home view and use DDAYS() to work out how many days you have been alive, then go to that value on the plotted graph. That will show you your biorhythm levels for that day.

Now unless you happen to be 21,252 (the lowest common multiple of 23,28 and 33, and also the value at which the sequence of the graphs starts over again) days old, or 58 years, 2 months and a bit, then your 3 biorhythm levels will have changed from what they were the moment you were born.

Interesting idea, complete pseudo-science as I have said, but a nice way to show the use of a few functions of the calculator.