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Subsets of data can be selected by column name, index, or Boolean expressions. For example, df[df['col1'] > 5] will return all rows in the DataFrame df for which the value of the column col1 exceeds 5. [4]: 126–128 Data can be grouped together by a column value, as in df['col1'].groupby(df['col2']), or by a function which is applied to the index.
The column space of a matrix is the image or range of the corresponding matrix transformation. Let be a field. The column space of an m × n matrix with components from is a linear subspace of the m-space. The dimension of the column space is called the rank of the matrix and is at most min(m, n). [1]
Leif was the son of Erik the Red and his wife Thjodhild (Old Norse: Þjóðhildur), and, through his paternal line, the grandson of Thorvald Ásvaldsson.When Erik the Red was young, his father was banished from Norway for manslaughter, and the family went into exile in Iceland (which, during the century preceding Leif's birth, had been colonized by Norsemen, mainly from Norway).
The Oppo Find X is the 2018 flagship smartphone from the Oppo Find series and was launched on 19 June 2018 in Paris by Oppo. The Find X features a different design from traditional smartphones, as it has a mechanic pop-up camera. [ 1 ]
Beautiful Soup was started in 2004 by Leonard Richardson. [citation needed] It takes its name from the poem Beautiful Soup from Alice's Adventures in Wonderland [5] and is a reference to the term "tag soup" meaning poorly-structured HTML code. [6]
The resolution, "Proposing an amendment to the Constitution of the United States relative to equal rights for men and women", reads, in part: [1] Resolved by the Senate and House of Representatives of the United States of America in Congress assembled (two-thirds of each House concurring therein), That the following article is proposed as an amendment to the Constitution of the United States ...
An undefined value must not be confused with empty string, Boolean "false" or other "empty" (but defined) values. Depending on circumstances, evaluation to an undefined value may lead to exception or undefined behaviour, but in some programming languages undefined values can occur during a normal, predictable course of program execution.
Tool is an American rock band formed in Los Angeles in 1990. It consists of vocalist Maynard James Keenan, guitarist Adam Jones, drummer Danny Carey and bassist Justin Chancellor, who replaced founding member Paul D'Amour in 1995.