How to set up macros that will work when aditional data is added

[John]

I want to write macros that will automatically update the spreadsheet when I
add further data. For example I have 10 columns x 8 rows of dat and write a
macro to generate average and standard error of the mean in the cells below
each column. Later, when I get the results from the next set of experiments
I insert a further 8 rows of data giving me 16 rows in all. Is it possible
to construct a macro that will handle this or do I just have to insert the
formula again this time for 16 rows?

This may sound trivial but we have lots of data accross many different
experiments and it would be more elegant and efficient if I could produce a
spreadsheet that our students could just paste their results into that would
do the necessary calculations for them.

 

[joel]

A macro works the same as a worksheet function. SAuppose you have a range
from A1:A10 and you put in cell A11 the formula "=sum(A1:A10)". Adding a row
at row number 5 will change the formula now at A12 to "=Sum(A1:A11"). The
problem is if you add the new row at row number 11 the formula will move to
A12 but the formula will remain at "=sum(A1:A10)".

What I usually will do is add a new row at row 10. This will move the
fromula to A12 and update the formula to "=Sum(A1:A11"). The problem is the
data at A10 is at A11 and the cell A10 is empty. I then copy A11 to A10 and
then put the new data at A11 to put the new data after the old data.

The same thing applies if you are adding multiple rows.

 

[Jacob Skaria]

Use a loop to get the last filled row.

OR

The below will give you the last filled row in Column A.
lngLastRow = ActiveSheet.Cells(Rows.Count, "A").End(xlUp).Row

If this post helps click Yes

 

[Jon Peltier]

Put the data into a List (Excel 2003) or a Table (Excel 2007). When data is
added just below a list or table, the list or table expands to include the
added data. Formulas that refer to whole columns in lists and tables keep
referring to the entire column even as the column changes its number of
rows.

Alternatively, put a blank row below the tabulated data, color it yellow or
gray so it looks different than a data row, but include the blank row in
formulas that analyze the column. Train the lab monkeys to insert one or
more rows above this shaded row and put their data into the inserted rows.

- Jon
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Jon Peltier, Peltier Technical Services, Inc.
http://PeltierTech.com/WordPress/
Advanced Excel Conference - June 17-18 2009 - Charting and Programming
http://peltiertech.com/Training/2009-06-ACNJ/AdvExcelConf200906ACNJ.html
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