hash coding - definizione. Che cos'è hash coding
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Cosa (chi) è hash coding - definizione

PORTION OF A GENE'S DNA OR RNA, COMPOSED OF EXONS, THAT CODES FOR PROTEIN; COMPOSED OF CODONS, WHICH ARE DECODED, TRANSLATED INTO PROTEINS BY THE RIBOSOME; BEGINS WITH THE START CODON AND END WITH A STOP CODON
Coding sequence; Coding regions; Coding DNA sequence; Protein coding region; Protein coding sequence; Gene coding; Coding DNA; Protein-coding
  • '''Transcription''': RNA Polymerase (RNAP) uses a template DNA strand and begins coding at the promoter sequence (green) and ends at the terminator sequence (red) in order to encompass the entire coding region into the pre-mRNA (teal). The pre-mRNA is polymerised 5' to 3' and the template DNA read 3' to 5'
  • Karyotype}}
  • An electron-micrograph of DNA strands decorated by hundreds of RNAP molecules too small to be resolved. Each RNAP is transcribing an RNA strand, which can be seen branching off from the DNA. "Begin" indicates the 3' end of the DNA, where RNAP initiates transcription; "End" indicates the 5' end, where the longer RNA molecules are completely transcribed.
  • '''Point mutation types:''' transitions (blue) are elevated compared to transversions (red) in GC-rich coding regions.

hash coding      
<programming, algorithm> (Or "hashing") A scheme for providing rapid access to data items which are distinguished by some key. Each data item to be stored is associated with a key, e.g. the name of a person. A hash function is applied to the item's key and the resulting hash value is used as an index to select one of a number of "hash buckets" in a hash table. The table contains pointers to the original items. If, when adding a new item, the hash table already has an entry at the indicated location then that entry's key must be compared with the given key to see if it is the same. If two items' keys hash to the same value (a "hash collision") then some alternative location is used (e.g. the next free location cyclically following the indicated one). For best performance, the table size and hash function must be tailored to the number of entries and range of keys to be used. The hash function usually depends on the table size so if the table needs to be enlarged it must usually be completely rebuilt. When you look up a name in the phone book (for example), you typically hash it by extracting its first letter; the hash buckets are the alphabetically ordered letter sections. See also: btree, checksum, CRC, pseudorandom number, random, random number, soundex. (1997-08-03)
Hash Code (programming competition)         
TEAM PROGRAMMING COMPETITION ORGANIZED BY GOOGLE
Draft:Hash Code (programming competition); Google Hash Code
Hash Code is a global team programming competition organized by Google. The participants work in teams of 2-4 people solving a programming challenge inspired by software engineering at Google.
hash table         
  • Hash collision by separate chaining with head records in the bucket array.
  • Hash collision resolved by open addressing with linear probing (interval=1). Note that "Ted Baker" has a unique hash, but nevertheless collided with "Sandra Dee", that had previously collided with "John Smith".
  • Hash collision resolved by separate chaining
  • This graph compares the average number of CPU cache misses required to look up elements in large hash tables (far exceeding size of the cache) with chaining and linear probing. Linear probing performs better due to better [[locality of reference]], though as the table gets full, its performance degrades drastically.
ASSOCIATES DATA VALUES WITH KEY VALUES - A LOOKUP TABLE
Hashtable; Hash-table; Hash tables; Hash map; Rehash; Hashmap; Open hashing; Scatter storage; Address-calculation sort; Hash Table; Chaining hash table; Separate chaining; Direct chaining; Collision resolution scheme; External chaining; Load factor (computer science); Hash-Based Indexes; Hash table collisions; Hash table collision; Array hash table; Dynamic-sized hash table; Collision resolution in hash tables

Wikipedia

Coding region

The coding region of a gene, also known as the coding sequence (CDS), is the portion of a gene's DNA or RNA that codes for protein. Studying the length, composition, regulation, splicing, structures, and functions of coding regions compared to non-coding regions over different species and time periods can provide a significant amount of important information regarding gene organization and evolution of prokaryotes and eukaryotes. This can further assist in mapping the human genome and developing gene therapy.