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In computer science, an inverted index (also referred to as a postings list, postings file, or inverted file) is a database index storing a mapping from content, such as words or numbers, to its locations in a table, or in a document or a set of documents (named in contrast to a forward index, which maps from documents to content). [1]
The forward index is sorted to transform it to an inverted index. The forward index is essentially a list of pairs consisting of a document and a word, collated by the document. Converting the forward index to an inverted index is only a matter of sorting the pairs by the words. In this regard, the inverted index is a word-sorted forward index.
The point P is the inversion point of Q; the polar is the line through P that is perpendicular to the line containing O, P and Q. If point R is the inverse of point P then the lines perpendicular to the line PR through one of the points is the polar of the other point (the pole). Poles and polars have several useful properties:
The resulting futures or forward curve would typically be downward sloping (i.e. "inverted"), since contracts for further dates would typically trade at even lower prices. [2] In practice, the expected future spot price is unknown, and the term "backwardation" may refer to "positive basis", which occurs when the current spot price exceeds the ...
If the original curve is a line then the inverse curve will pass through the center of inversion. If the original curve passes through the center of inversion then the inverted curve will be a line. The inverted curve will be the same as the original exactly when the curve intersects the circle of inversion at right angles.
Inverted question and exclamation marks ¡ Inverted exclamation mark: Exclamation mark, Interrobang ¿ Inverted question mark: Question mark, Interrobang < Less-than sign: Angle bracket, Chevron, Guillemet Lozenge: Square lozenge ("Pillow") ☞ Manicule: Index, Obelus: º: Masculine ordinal indicator: Feminine ordinal indicator, Degree sign ...
Inverted logistic S-curve to model the relation between wheat yield and soil salinity. Many natural processes, such as those of complex system learning curves, exhibit a progression from small beginnings that accelerates and approaches a climax over time. When a specific mathematical model is lacking, a sigmoid function is often used. [6]
The Hamming distance (the number of bits in which they differ) between the present bus value (also counting the present invert line) and the next data value is computed.; If the Hamming distance is larger than n/2, invert is set to 1, and the next bus value is made equal to the inverted next data value.