Reading in the values from excel

I have made a program the reads in values from an excel table and in order to find the average of n number of values in a column. The problem that I am having is I only know how to find the average of all the values in a column, not just the first 10 values in the column. If someone could help I'd appreciate it.

if true
if y == 0.2
  column = 3;
  x = mean(data_in(:,3));
  s = std(data_in(:,3));
end

Answer 1

[KL]

replace

x = mean(data_in(:,3));

with

 x = mean(data_in(1:10,3));

1:10 could be any number indices within its limits

[soyfrijole]

Oh thank you. I was trying to do (n,3) and kept getting an error.

[KL]

n should be a vector, like in my example,

 n = 1:10

if they are not continuous then,

 n = [1 3 8 9 15 ...]