I have an Excel worksheet in which I want to begin by checking column 7 (G) for the presence of a 0 (zero). If it is a zero, change it to a 1 and then in column 9 (J) calculate the log base 2 ratio of column 8 (H) to column 7 (G).

Then, check column 8 (H) for the presence of a zero. If it is a zero change it to a 1, and calculate the log base 2 ratio of column 8 (H) to column 7 (G).

Then do this for every 12 columns; so the next columns to check would be column 20 (T) and column 21 (U) for the presence of 0's and calculate the log base 2 in column V (21). Then columns 32 and 33 are checked for 0's, and the log base 2 calculated in column 34, etc, until the end of the worksheet which can have a variable amount of columns.

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