Matrices Summary


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  • A matrix is a rectangular array of numbers, arranged in rows and columns.
  • Order of a matrix = Number of rows in it x Number of columns in it
  • Row matrix is a matrix with only one row.
  • Column matrix is a matrix with only one column.
  • Zero or Null matrix is a matrix in which every element is zero.
  • Unit or Identity matrix is a square matrix in which the diagonal elements (top left to bottom right) are each equal to 1 and all the other non diagonal elements are zero (0). It is denoted by I.
  • Two matrices are said to be compatible for multiplication, if the number of columns in the first matrix is the same as the number of rows in the second matrix.


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