Arrays

Arrays

1. Matrix Addition And Subtraction

   • To add or subtract two matrices of the same size, add or subtract resources in the same position to produce another array of the same size.
   • Properties
     • a) Commutative: A + B = B + A
     • b) Associative: A + (B + C) = (A + B) + C
     • c) Neutral element: The null matrix of the size correspondent.
     • d) Opposite element of A: The matrix -A, which results from change the sign of the elements of A

2. It is a set of numbers or expressions, arranged in a rectangular shape, forming rows and columns.

   • Types of matrices
     • Null matrix
       • Matrix Row
         • Matrix Column
           • Square matrix
             • Rectangular Matrix
               • Upper Triangle
                 • Lower Triangle
   • Elements Of A Matrix

3. Die Applications

   • Exports, in millions of euros, from 3 countries A, B, C to three others X, Y, Z, in the years 2000 and 2001 They are given by the matrices:
     • Calculate and express in matrix form the total exports for the whole of the two years.
       • How many millions has country B exported to Z in total?
         • Calculate the increase in exports from the year 2000 to 2001 with the data from the previous example

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