Biorythm Using Fuzzy logic

A biorhythm (from Greek βιορυθμός - biorhuthmos) is a hypothetical cycle in physiological, emotional, or intellectual well-being or prowess. "Bio" pertains to life and "rhythm" pertains to the flow with regular movement. Biorhythms theory has no more predictive power than chance and has been labeled a pseudoscience by skeptics.

Basic theory

The theory of biorhythms claims that one's life is affected by rhythmic biological cycles, and seeks to make predictions regarding these cycles and the personal ease of carrying out tasks related to the cycles. These inherent rhythms are said to control or initiate various biological processes and are classically composed of three cyclic rhythms that are said to govern human behavior and demonstrate innate periodicity in natural physiological change: the physical, the emotional, and the intellectual (or mental) cycles. Others claim there are additional rhythms, some of which may be combinations of the three primary cycles. Some proponents think that biorhythms may be potentially related tobioelectricity and its interactions in the body.

Basic rhythms follow certain facets of physiological cycles, though they may include others, and the details may vary depending on the source. The three classical cycles of biorhythms are endogenous infradian rhythms. The theory's basis lies in physiological and emotional cycles. They are often represented graphically as either symmetric or asymmetric waveforms, though most theories rely on symmetric forms. The most commonly used form is the sinusoidalwaveform, which is thought to be a plausible representation of a bioelectric activity cycle. Due to this sinusoidal nature, the cyclical flow of bioelectric activity undergoes periodic reverses in direction. Each cycle oscillates between a positive phase [0%..100%] and a negative phase [-100%..0%], during which bioelectric activity strengthens and weakens. The waveforms start, in most theories, at the neutral baseline (0%) at the time of birth of each individual. Each day that the waveform again crosses this baseline is dubbed a critical day, which means that tasks in the domain of the cycle are far more erratic than on other non-critical days. The purpose of mapping the biorhythmic cycles is to enable the calculation of critical days for performing or avoiding various activities.

The classical definition (derivatives of the original theory exist) states that one's birth is an unfavorable circumstantial event, as is the day about 58 years later when the three cycles are again synchronised at their minimum values. According to the classical definition, the theory is assumed to apply only to humans. In the classical theory, the value of each cycle can be calculated at any given time in the life of an individual, and there are web sites that do exactly that.

Application

In the workplace, railroads and airlines have experimented the most with biorhythms. A pilot describes the Japanese and American attitudes towards biorhythms.^[3] He acknowledges, researching his pilot logbook, that his greatest errors of judgment occurred during critical days, but concludes that an awareness of one's critical days and paying extra attention is sufficient to ensure safety. A former United Airlines pilot and user of the Biorhythms for Windows^[4]program confirms that United Airlines used biorhythms until the mid-1990s, while the Nippon Express air freight still used biorhythms.

Charting biorhythms for personal use was popular in the United States during the 1970s; many places (especially video arcades and amusement areas) had a biorhythm machine that provided charts upon entry of date of birth.

Proponents of biorhythmics call it an established interdisciplinary area of scientific endeavor which is still speculative - a protoscience. Critics state that biorhythms are based only upon numerological associations. The plausibility of biorhythmics is contested by mathematicians, biologists and other scientists.^{[citation needed]} The most basic assertion is that even if it is assumed that physiological rhythms do exist, it's not clear why they should necessarily begin on the day of one's birth.

The Biorhythm theory is often treated as falsely claiming scientific validity. Biorhythm critics' responses range from opposing it as harmful to ignoring it or treating it as entertainment. Some of the criticisms of the various theories in the category of biorhythmics are:

§ The choices of periodical function, frequency and phase are arbitrary.

§ The assumption is made that the cycles are the same for everyone.

§ The frequency is assumed to be constant.

§ Evidence tends to be anecdotal.

§ Arguments are made based in ignorance of number theory.

§ Tests of the hypothesis have basic flaws.

§ The quantitative generalizations of complex human behavior are inadequate.

§ Hypotheses are not formulated precisely.

§ Experimental data fail peer review.

§ Experiments cannot be replicated.

§ Some unscrupulous practitioners resemble professional fortune-telling fraud artists.

Some biorhythm critics say that biorhythms can be thrown off by such occurrences in the calendar as the beginning of the new year, holidays, or something as simple as the start of the week.^{[citation needed]}

There have been some three dozen studies supporting biorhythm theory but all of them have suffered from methodological and statistical errors.^[5] An examination of some 134 biorhythm studies found that the theory is not valid.^[5

With fuzzy logic taken the birth date as the control input we can determine the degree of one physical, emotional and intellectual strength.

Calculation

The equations for the curves are

§ physical: sin(2πt / 23),

§ emotional: sin(2πt / 28),

§ intellectual: sin(2πt / 33),

§ intuitive: sin(2πt / 38),

Where t indicates the number of days since birth.