1. ## Biorythm

I have tried for a while to get it right...
I need to plot the three birythm curves. The curves start at your birthday, following a sinus waveform and have following periods: emotional curve 28 days, physical curve 23 days and intellectual 33 days.

I need to plot any ones curves for any interval, given the persons birthdate, startdate for the interval and length of the interval.

Anyone that can help on this one?

Rgds, Stefan

2. Hello, Stefan!

I need to plot the three biorhythm curves.
The curves start at your birthday, following a sine waveform and have following periods:
emotional curve 28 days, physical curve 23 days and intellectual 33 days.

I need to plot any ones curves for any interval, given the person's birthdate,
startdate for the interval and length of the interval.

The basic curves are: .$\displaystyle y\:=\:\sin\left(\frac{2\pi}{28}t\right)\quad y\:=\:\sin\left(\frac{2\pi}{23}t\right)\quad y\:=\:\sin\left(\frac{2\pi}{33}t\right)$

. . where $\displaystyle t$ is the number of days since the person's birth.

You will need a separate algorithm to calculate $\displaystyle t$

. . for any birthdate and any start-date for the interval.