dataA=[dataA; sum(data((​i,n):(i+2,​n)))]; ...the matlab is telling it is invalid syntax how to rectifyit?

matlab is saying there might be some missing )]} iam not able to understand

Answer 1

[Jan]

This is no valid Matlab code:

data((i,n):(i+2,n))

Maybe you mean:

data(i:i+2, n)

or

data(i,n):data(i+2,n)

The error message is not really matching. There is no missing parenthesis or bracket, but an invalid indexing operation.