Morring Matrix with Google Drive SpreadSheets

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I'm trying to mirror a matrix over a diagonal, but i don't know how. Is there a way of getting the cell in some position of a selection of the type C5:P5 ?

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I'm looking for a function for each column or row of the inferior part of the matrix.

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Scott Craner On BEST ANSWER

Use this formula in the first cell B4:

=OFFSET(B4,-1*(ROW(1:1)-COLUMN(A:A)+1),ROW(1:1)-COLUMN(A:A)+1,1,1)

Change the B4 to the cell address into which cell you placed the formula.

Then copy and paste the cell into all the desired cells.

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It works in Google as well:

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