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| Summary |
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 A matrix is a rectangular array of numbers, arranged in rows and columns. |
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Order of a matrix = Number of rows in it x Number of columns in it |
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Row matrix is a matrix with only one row. |
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Column matrix is a matrix with only one column. |
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Zero or Null matrix is a matrix in which every element is zero. |
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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. |
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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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