sparse


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sparse

A sparse matrix (or vector, or array) is one in which most of the elements are zero. If storage space is more important than access speed, it may be preferable to store a sparse matrix as a list of (index, value) pairs or use some kind of hash scheme or associative memory.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
References in classic literature ?
White, a slender, frail little man whose hand seemed strangely cold, as if he were suffering from a chill, and whose whiskers were sparse and silky.
Her turban was twice as large as the largest of any of the others; her eyebrows met, her nose was rather flat, her mouth was large but with ruddy lips, and her teeth, of which at times she allowed a glimpse, were seen to be sparse and ill-set, though as white as peeled almonds.
If D'Artagnan had been a poet, it was a beautiful spectacle: the immense strand of a league or more, the sea covers at high tide, and which, at the reflux, appears gray and desolate, strewed with polypi and seaweed, with pebbles sparse and white, like bones in some vast old cemetery.
The vegetation here was sparse and of a weird, colorless nature, though what did grow was wondrous in shape and form.
It was the same with his hair, sparse and irregular of growth, muddy-yellow and dirty-yellow, rising on his head and sprouting out of his face in unexpected tufts and bunches, in appearance like clumped and wind-blown grain.
His hair, now white and sparse, left uncovered a broad and protuberant skull, which gave a strong idea of his character and firmness.
In this latter end of autumn, with a sparse remnant of yellow leaves falling slowly athwart the dark evergreens in a stillness without sunshine, the house too had an air of autumnal decline, and Mr.
After a steep climb and a short walk they halted at the edge of a precipitous cliff and Schneider looked down into a narrow gulch where a single tree grew beside a tiny rivulet and sparse grass broke from a rock-strewn soil.
"You see," said he, whisking round, and showing one little strip where a line of scattered hairs, like the last survivors in some fatal field, still barely held their own against the fate which had fallen upon their comrades; "these locks need some little oiling and curling, for I doubt not that if you look slantwise at my head, when the light is good, you will yourself perceive that there are places where the hair is sparse."
There are three main parts of compressive sensing theory, including sparse representation of signal, projection observation of measurement matrix, and sparse reconstruction of signal.
[5] thought about sparse attacks that target crucial sensors, which are sensitive to attacks and crucial for the observability of the power system.