Re: Problem with Function (there isn't any...)

*To*: mathgroup at yoda.ncsa.uiuc.edu*Subject*: Re: Problem with Function (there isn't any...)*From*: decide!bobk at uunet.UU.NET (Bob Korsan)*Date*: Mon, 8 Oct 90 14:16:06 PDT

If you further define In[1]:= h=Function[x,x + -x^2] Out[1]:= Function[x, x- x^2] In[2]:= h'[2] Out[2]:= -3 The trick is that Subtract is not associative and hence In[3]:= D[Funcion[x, x-x^2],x] (1,0) 2 (0,1) 2 Out[3]:= Function[x, Subtract [x, x ] + Subtract [x, x ] 2 x] All in all, this is the reason why languages like APL have a different symbol which is used for negation and for subtraction. They are different concepts. Peace Bob Korsan