Where time is a 1x301 vector so value for length(time) should be 301, and d is a 1x330 vector so the value for length(d) should be 330. Therefore the value for tstep should be (301-1)/330=0.909090
When I put this above value manually into vect1, it gives me the correct vector that I am looking for, but I'm using the tstep value given by the calculation above (using the length function), it doesn't work. It gives me a 1x34 vector for example.
Thanks a lot for your help I really have no idea what's wrong here ! :-)