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For the purposes of these tables, a, b, and c represent valid values (literals, values from variables, or return value), object names, or lvalues, as appropriate.R, S and T stand for any type(s), and K for a class type or enumerated type.
In C, for instance, the following statement is legal and well-defined, and depends on the fact that array indexing returns an l-value: x = ++ a [ i ]; An important use is when a left-associative binary operator modifies its left argument (or produces a side effect ) and then evaluates to that argument as an l-value.
R is a programming language for statistical computing and data visualization. It has been adopted in the fields of data mining, bioinformatics and data analysis. [9] The core R language is augmented by a large number of extension packages, containing reusable code, documentation, and sample data. R software is open-source and free software.
The following source code is a C implementation together with a minimal test. Function put() puts an item in the buffer, function get() gets an item from the buffer. Both functions take care about the capacity of the buffer :
The ternary operator can also be viewed as a binary map operation. In R—and other languages with literal expression tuples—one can simulate the ternary operator with something like the R expression c (expr1, expr2)[1 + condition] (this idiom is slightly more natural in languages with 0-origin subscripts).
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R-values can be l-values (see below) or non-l-values—a term only used to distinguish from l-values. Consider the C expression 4 + 9 . When executed, the computer generates an integer value of 13, but because the program has not explicitly designated where in the computer this 13 is stored, the expression is a non l-value.
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