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Row (database) In a relational database, a row, a.k.a. record or tuple, represents a single, implicitly structured data item in a table. A database table can be thought of as consisting of rows and columns. [ 1 ] Each row in a table represents a set of related data, and every row in the table has the same structure.
Row echelon form. In linear algebra, a matrix is in row echelon form if it can be obtained as the result of Gaussian elimination. Every matrix can be put in row echelon form by applying a sequence of elementary row operations. The term echelon comes from the French échelon ("level" or step of a ladder), and refers to the fact that the nonzero ...
Row equivalence. In linear algebra, two matrices are row equivalent if one can be changed to the other by a sequence of elementary row operations. Alternatively, two m × n matrices are row equivalent if and only if they have the same row space. The concept is most commonly applied to matrices that represent systems of linear equations, in ...
Matrix (mathematics) An m × n matrix: the m rows are horizontal and the n columns are vertical. Each element of a matrix is often denoted by a variable with two subscripts. For example, a2,1 represents the element at the second row and first column of the matrix. In mathematics, a matrix ( pl.: matrices) is a rectangular array or table of ...
A definition for matrices over a ring is also possible . The row space is defined similarly. The row space and the column space of a matrix A are sometimes denoted as C(AT) and C(A) respectively. [ 2] This article considers matrices of real numbers. The row and column spaces are subspaces of the real spaces and respectively.
Death row. Death row, also known as condemned row, is a place in a prison that houses inmates awaiting execution after being convicted of a capital crime and sentenced to death. The term is also used figuratively to describe the state of awaiting execution ("being on death row"), even in places where no special facility or separate unit for ...
The traditional terminology, in a strict application, varies between boats operating on salt water and in fresh water. "Rowing" at sea denotes each rower operating a pair of oars, one on each side of the boat. When each person uses a single oar on one side of the boat, that action is termed "pulling". In fresh water terminology, "rowing" is the ...
Record (computer science) In computer science, a record (also called a structure, struct, or compound data type) is a composite data structure – a collection of fields, possibly of different data types, typically fixed in number and sequence. [ 1]