MATLAB: Integration over elapsed time

Question

I have elapsed time and want to find velocity:(ie time would then be :[0 1 2 3 4 5 6]), any way to do this please, as following code only works when time is specified in increments:

etime = [0 1 1 1 1 1 1]; % elapsed time in sec
a = [0,2,4,7,11,17,24]; %acceleration in m/s^2
v(1)=0;
for k=1:6
    v(k+1) = trapz(etime(k:k+1), a(k:k+1))+ v(k);
end
disp([v'])

Answer 1

t = cumsum(etime);
v = cumtrapz(t, a);