PSEUDORANDOM Meaning and
Definition
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"Pseudorandom" refers to a sequence of numbers or events that appear to be random but are actually generated by a deterministic process or algorithm. It implies that the resulting sequence exhibits properties similar to those of truly random sequences, even though it follows a predetermined pattern.
In computer science and mathematics, pseudorandomness is crucial when genuine unpredictable randomness is impractical or impossible to achieve. Pseudorandom numbers are generated using algorithms called pseudorandom number generators (PRNGs). These algorithms take a starting value called a seed, which determines the sequence of numbers generated. While the output of a PRNG is not truly random, it strives to produce an unpredictable sequence that resembles randomness for practical purposes.
The pseudorandomness of a sequence is often evaluated by statistical tests that assess its randomness properties. These tests analyze various criteria, such as the distribution of numbers, their independence, correlation, and other statistical measures.
It is important to note that pseudorandomness should not be confused with true randomness. While pseudorandom sequences may exhibit randomness in certain aspects, they are always generated by a deterministic process that, given the same initial seed, will produce the same sequence of numbers. Therefore, pseudorandomness is primarily used for simulations, encryption, statistical modeling, and other applications where randomness is required but genuine random events are unavailable.
Etymology of PSEUDORANDOM
The word "pseudorandom" is derived from the combination of two terms: "pseudo" and "random".
1. "Pseudo" comes from the Greek word "pseudes", meaning "false" or "deceptive". It is often used as a prefix in English to denote something that only appears to be or imitates what it claims to be.
2. "Random" comes from the Middle English word "random", which originally meant "impetuous headlong rush or motion". Over time, it evolved to refer to a lack of pattern, predictability, or control.
When these two words are combined, "pseudorandom" refers to something that is not truly random but appears to be or mimics randomness. It is commonly used to describe sequences or values that exhibit characteristics of randomness but are generated by deterministic algorithms.
