Hello,

I have a big dataframe, and want to average two specific cells of two
specific rows and then replace those two rows with one row which contains
the averaged cells. Example (row 3 and 4: Cells2 and Cells3 averaged and
replaced)

    NameC1 C2 C3
  1  A  3  3  5
  2  B  2  7  4
  3  C  4  3  3
  4  C  4  4  6
  5  D  5  5  3



    NameC1 C2  C3
  1  A  3  3   5
  2  B  2  7   4
  3  C  4  3.5 4.5  4  D  5  5   3


Many thanks in advance!

Best,

Verena

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