If you consider are at [x1,y1,z1] at t=0 and [xn,yn,zn] at t=1, then you can write following line using linear interpolation
X1 = [2 3 4]; % starting value
Xn = [7 2 5]; % ending value
t1 = 0; % start time
tn = 1; % end time
t = linspace(0, 1, 500); % samples between start and end time
X = interp1([t1 tn], [X1; Xn], t);
