How can I make a new vector by applying operations from an old vector?

I have a column vector

and I want to create a new column vector out of the previous one

I'm specifically having issues with indexing the first element since I tried to use a summation to define each element of the new column vector as

.

Answer 1

[madhan ravi]

Simply use diff(...)

[Johanna Alumbro]

Thanks! I'm new to MATLAB. I was wondering how I can retain the first element then do diff with succeeding elements?

[madhan ravi]

Just add zero as the first element.