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Summary 1. Simple sum - HEC
www.hec.ca3. Double index To represent the data of a table or a matrix, we often use a double index notation, like T Ü Ý where the first index (i) corresponds to the number of the row where the data is located and the second (j) to the column. For example, the term T24 represents the data
Index Notation for Vector Calculus - New Mexico Institute ...
www.ees.nmt.eduIndex Notation 3 The Scalar Product in Index Notation We now show how to express scalar products (also known as inner products or dot products) using index notation. Consider the vectors~a and~b, which can be expressed using index notation as ~a = a 1ˆe 1 +a 2ˆe 2 +a 3eˆ 3 = a iˆe i ~b = b 1ˆe 1 +b 2ˆe 2 +b 3eˆ 3 = b jˆe j (9)