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  • is any square matrix.


  • This function shows the main diagonal values.
  • In , is any square matrix.
  • The main diagonal of a matrix consists of those elements that lie on the diagonal that runs from top left to bottom right.
  • Main diagonal is also called principal diagonal, primary diagonal, leading diagonal, or major diagonal.
  • So main diagonal of a matrix A is defined by A is the collection of entries ,where i=j.
  • Diagonal entries are and so on.


  1. MATRIXDIAGONAL([[14,12],[13,15]]) = 14 15
  2. MATRIXDIAGONAL([[1,2,3],[4,5,6],[9,8,6]]) = 1 5 6
  3. MATRIXDIAGONAL([[5,8,12,13],[4,3,2,8],[7,2,5,3],[3,5,9,11]]) = 5 3 5 11

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