The problem is (at least I assume this), that you cannot see the last element. This happens, because it is a scalar. Such "points" are not visible in a line plot, because they do not have an extend.
x = [ 5 15 30 50 80 115];
d = [ 0.9901 1.0184 0.8291 2.2491 NaN 0.0738];
plot(x, d)
But you can draw the points also, which might be the better choice at all for a discontinuous signal:
plot(x, d, '-o')
Unfortunately you did not mention, how you want to look the output like.
