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[4]: 114 A DataFrame is a 2-dimensional data structure of rows and columns, similar to a spreadsheet, and analogous to a Python dictionary mapping column names (keys) to Series (values), with each Series sharing an index. [4]: 115 DataFrames can be concatenated together or "merged" on columns or indices in a manner similar to joins in SQL.
Polar variables are magnetic white dwarfs accreting material from a low mass donor, with no accretion disk due to the intense magnetic field. In astronomy, a polar is a highly magnetic type of cataclysmic variable (CV) binary star system, originally known as an AM Herculis star after the prototype member AM Herculis.
As to order, some authors list the azimuth before the inclination (or the elevation) angle. Some combinations of these choices result in a left-handed coordinate system. The standard "physics convention" 3-tuple set ( r , θ , φ ) {\displaystyle (r,\theta ,\varphi )} conflicts with the usual notation for two-dimensional polar coordinates and ...
In mathematics, the polar decomposition of a square real or complex matrix is a factorization of the form =, where is a unitary matrix and is a positive semi-definite Hermitian matrix (is an orthogonal matrix and is a positive semi-definite symmetric matrix in the real case), both square and of the same size.
Topping the new laws that go into effect on Jan. 1 is the state's new paid pre-natal leave policy, allowing pregnant employees to take 20 hours of paid leave for a long list of pregnancy-related ...
Topping the list of Mercosur's most likely new trade pacts next year are deals with the European Free Trade Association of four non-EU nations and with the United Arab Emirates, the diplomats said ...
The real polar of a subset of is the set: := { : , } and the real prepolar of a subset of is the set: := { : , }.. As with the absolute prepolar, the real prepolar is usually called the real polar and is also denoted by . [2] It's important to note that some authors (e.g. [Schaefer 1999]) define "polar" to mean "real polar" (rather than "absolute polar", as is done in this article) and ...
Rumors, rumors, rumors. In speaking to David Boreanaz for the release of the SEAL Team: The Final Season DVD, we were able to get clarification on a rumor that seemed to come directly from him ...