R and Mathematica are also 1 based. And R really is popular (<a href="http:&#x2F;&#x2F;www.tiobe.com&#x2F;tiobe_index?page=index" rel="nofollow">http:&#x2F;&#x2F;www.tiobe.com&#x2F;tiobe_index?page=index</a> - ok, popularity is droping right now, likely b&#x2F;c of Julia ;-))