Sinusoidal variation

Cycle is a Chinese vocabulary, pronounced zh?u qī: and it comes from Jing Zhai Gu Jin Qu. If a group of events or phenomena appear repeatedly in the same order, the time or space interval to complete this group of events or phenomena is called cycle.

Mathematical cycle—

The time required to complete a vibration is called the vibration period. If f(x) is a periodic function, the smallest positive number L that makes f(x+l)=f(x) hold for any x in the defined domain is called the (basic) period of f(x). In a computer, the time required to complete a cycle; Or the time required to access the memory once, also called cycle. The essence of periodic function: when the difference between the two independent variables is equal to the multiple of the period, the function values of the two independent variables are equal. If f(x+6) =f(x-2), the period of the function is T=8.

Three cycles