DescriptionCenteredtriangularnumber19.svg English: 19 balls arranged as a triangle. Deutsch: 19 Kugeln in Form eines Dreiecks ausgelegt. Date 9 February
sin(theta); % " % Draw triangular spikes; leave every 2nd spike white for k = 1 : (number_of_spikes/2) % k goes from 1 to the number of endpoints along the