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dplyr is an R package whose set of functions are designed to enable dataframe (a spreadsheet-like data structure) manipulation in an intuitive, user-friendly way. It is one of the core packages of the popular tidyverse set of packages in the R programming language. [1]
[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.
More generally, the polars of all the points on the line q must pass through its pole Q. The relationship between poles and polars is reciprocal. Thus, if a point A lies on the polar line q of a point Q, then the point Q must lie on the polar line a of the point A. The two polar lines a and q need not be parallel.
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Murphy’s office said his Hartford home was the target of a bomb threat, “which appears to be part of a coordinated effort involving multiple members of Congress and public figures.”
Since a TVS's topology is completely determined by the open neighborhoods of the origin, this means that via operation of taking the polar of a set, the collection of equicontinuous subsets of ′ "encode" all information about 's topology (i.e. distinct TVS topologies on produce distinct collections of equicontinuous subsets, and given any ...
A grainy mobile phone photo of one of the world’s most iconic cats prowling in the snow is offering conservationists hope that an endangered species may be making a comeback.