cosine of direction
1Cosine similarity — is a measure of similarity between two vectors by measuring the cosine of the angle between them. The cosine of 0 is 1, and less than 1 for any other angle. The cosine of the angle between two vectors thus determines whether two vectors are… …
2Direction cosine — In analytic geometry, the direction cosines of a vector are the cosines of the angles between the vector and the three coordinate axes. Or equivalently it is the component contributions to the unit vector. If v is a vector where is a basis. Then… …
3direction cosine — Math. the cosine of the angle made by a given vector and a coordinate axis. Cf. direction angle. [1890 95] * * * …
4cosine law — noun : either of two laws of radiation: a. : the radiant flux emitted in a given direction from a given small area of a perfectly diffusing surface varies as the cosine of the angle of emission b. : the irradiation by parallel rays falling on a… …
5direction cosine — noun : one of the cosines of the three angles between a directed line in space and the positive directions of the axes of a rectangular Cartesian coordinate system usually used in plural * * * Math. the cosine of the angle made by a given vector… …
6direction cosine — noun Date: circa 1889 any of the cosines of the three angles between a directed line in space and the positive direction of the axes of a rectangular Cartesian coordinate system usually used in plural …
7direction angle — Math. an angle made by a given vector and a coordinate axis. Cf. direction cosine. [1930 35] * * * …
8direction angle — noun : an angle made by a given line with an axis of reference; specifically : one of the three angles made by a straight line with the three axes of a rectangular coordinate system * * * Math. an angle made by a given vector and a coordinate… …
9Lambert's cosine law — See also: Lambertian reflectance In optics, Lambert s cosine law says that the radiant intensity observed from a Lambertian surface or a Lambertian radiator is directly proportional to the cosine of the angle θ between the observer s line of… …
10Trigonometric functions — Cosine redirects here. For the similarity measure, see Cosine similarity. Trigonometry History Usage Functions Generalized Inverse functions …
