Truncating a vector from an addressed element in MatLab

[edwrai]

hi,
in MatLab, if you have x and y vectors and want to address an element in vector x, let's say i>=3 from which to construct a new vector x that starts from the addressed element until the last element and at the same time construct a new y vector corresponding to the new x vector?

x=[1 2 3 4 5 6 7]
y=[7 6 5 4 3 2 1]
new x should be=[4 5 6 7]
and new y =[4 3 2 1 ]


Maybe using an array=[x y]?

Any answer would be very much appreciated.
Thanks in advance

 

[MATLABdude]

Don't know if this is still useful or not, but you'd have to use the colon (:) operator. See the Mathworks page for more information and usage:
http://www.mathworks.com/access/helpdesk/help/techdoc/ref/colon.html

In your case, you'd use the following:
>> x = x(3:5);
>> y = y(3:5);

Once you read through the above page, you'll understand why.