noncontiguous cells

  • Thread starter Thread starter Guest
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Guest

I need to sum up a column of noncontiguous cells.
(eg. G3+G6+G9+G12); with the result being presented at
the bottom of the column.

However, whenever I insert rows in between the data and
the row that contains the total sum, I need to manually adjust the summation
formula.(eg. formula above + G15+G18+G21).
On the other hand, when I delete the rows in between the data and row that
contains the total sum, a reference error pops up. (so I need to manually
adjust my formula again)

I have at least 50 columns to perform this summation for. Is there any sort
of formula that helps to minimize the manual labour?

Thanks you in advance!
 
Vivian said:
However, whenever I insert rows in between the data and
the row that contains the total sum, I need to manually adjust th
summation
formula.(eg. formula above + G15+G18+G21).
Click to expand...

This doesn't seem right. Excel by default caters for rows being added
Can you explain the exact sequence of events, or post a sampl
spreadshee
 
Say that your datalist goes from G3 to G99.

You could enter this in G2 or G100, or wherever:

=SUMPRODUCT((MOD(ROW(INDIRECT("G3:G99")),3)=0)*INDIRECT("G3:G99"))
 
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