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Therefore, compilers will attempt to transform the first form into the second; this type of optimization is known as map fusion and is the functional analog of loop fusion. [2] Map functions can be and often are defined in terms of a fold such as foldr, which means one can do a map-fold fusion: foldr f z . map g is equivalent to foldr (f .
An internal iterator is a higher order function (often taking anonymous functions) that traverses a collection while applying a function to each element. For example, Python's map function applies a caller-defined function to each element:
Memory-mapped I/O is preferred in IA-32 and x86-64 based architectures because the instructions that perform port-based I/O are limited to one register: EAX, AX, and AL are the only registers that data can be moved into or out of, and either a byte-sized immediate value in the instruction or a value in register DX determines which port is the source or destination port of the transfer.
Digital Equipment Corporation invented a convention which used 19 (the device control 3 character , also known as control-S, or XOFF) to "S"top transmission, and 17 (the device control 1 character , a.k.a. control-Q, or XON) to start transmission. It has become so widely used that most don't realize it is not part of official ASCII.
In the sense that a GTM explicitly requires a smooth and continuous mapping from the input space to the map space, it is topology preserving. However, in a practical sense, this measure of topological preservation is lacking. [31] The growing self-organizing map (GSOM) is a growing variant of the self-organizing map. The GSOM was developed to ...
A hash function that maps names to integers from 0 to 15. There is a collision between keys "John Smith" and "Sandra Dee". A hash function is any function that can be used to map data of arbitrary size to fixed-size values, though there are some hash functions that support variable-length output. [1]
A map is a function, as in the association of any of the four colored shapes in X to its color in Y. In mathematics, a map or mapping is a function in its general sense. [1] These terms may have originated as from the process of making a geographical map: mapping the Earth surface to a sheet of paper. [2]
Device interfaces and input/output capabilities are sometimes provided using memory-mapped files. Applications that interact with devices open a location on the filesystem corresponding to the device, as they would for an ioctl call, but then use memory mapping system calls to tie a portion of their address space to that of the kernel.