I have MXINret which is a 260-row vector with one stock index's returns for 260 consecutive trading days. I want to create a vector MXINcum which will find cumulative returns using MXINret. This is easy enough and will use the MATLAB-equivalent of the standard (1+x2)*(1+y1)-1 formula where x2 is the daily return for a certain day and y1 is the cumulative return for the previous day. However, I want the first element of my MXINcum matrix to simply copy the first element of the MXINret matrix. How do I do this? Using a if function (with/without a for loop) or is there a simpler way to do this?
Many thanks for your help ! This is my first question here so apologies if I've violated any forum customs !
