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If is a vector-valued random variable, with values in , and thought of as a column vector, then a natural generalization of variance is [() ()], where = and is the transpose of , and so is a row vector.
The letter may be followed by a subscript: a number (as in x 2), another variable (x i), a word or abbreviation of a word (x total) or a mathematical expression (x 2i + 1). Under the influence of computer science , some variable names in pure mathematics consist of several letters and digits.
A variadic macro is a feature of some computer programming languages, especially the C preprocessor, whereby a macro may be declared to accept a varying number of arguments. Variable-argument macros were introduced in 1999 in the ISO/IEC 9899:1999 ( C99 ) revision of the C language standard, and in 2011 in ISO/IEC 14882:2011 ( C++11 ) revision ...
Random variables are usually written in upper case Roman letters, such as or and so on. Random variables, in this context, usually refer to something in words, such as "the height of a subject" for a continuous variable, or "the number of cars in the school car park" for a discrete variable, or "the colour of the next bicycle" for a categorical variable.
Much of the time, a recipe will provide certain cues and reminders of the places where these details of ingredient chemistry really matter, like when a recipe calls for a select number of "large ...
President-elect Donald Trump has said he might install his picks for top administration posts without first winning approval in the U.S. Senate. This would erode the power of Congress and remove a ...
Buy new — or used? Winner of the 2024 World Car of the Year award, the Kia EV9, at the New York International Auto Show at the Jacob Javits Convention Center in New York City last March.
In mathematics and in computer programming, a variadic function is a function of indefinite arity, i.e., one which accepts a variable number of arguments. Support for variadic functions differs widely among programming languages. The term variadic is a neologism, dating back to 1936–1937. [1] The term was not widely used until the 1970s.