Data Science in Theory and Practice. Maria Cristina Mariani
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Definition 2.5 (Transpose of a matrix) The transpose operation
Example 2.2
Definition 2.6 (Scaler multiplication of a matrix) The product of a scalar
In other words,
Definition 2.7 (Matrix addition) The sum of two vectors of the same size is the vector obtained by adding corresponding entries in the vectors:
In other words,
Definition 2.8 (Matrix multiplication) Suppose
In other words, the entry in row
Example 2.3
then