OR function

OR function

[′ȯr ‚fəŋk·shən]
(computer science)
or
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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In other words, with time steps of size h, the next or t 1 value of the variable x is equal to the old value at time t minus the value of a certain mathematical expression or function when y has a particular value.