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2.2 Some Basics of Matrix Algebra 2.2.1 Vectors

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Definition 2.1 (Vector) A vector is an array of real numbers , and it is written as:


Definition 2.2 (Scaler multiplication of vectors) The product of a scalar , and a vector is the vector obtained by multiplying each entry in the vector by the scalar:


Definition 2.3 (Vector addition) The sum of two vectors of the same size is the vector obtained by adding corresponding entries in the vectors:


so that is the vector with the th element .

Data Science in Theory and Practice

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