Re: Mathematica and Matrices (From sci.math.symbolic)

*To*: mathgroup*Subject*: Re: Mathematica and Matrices (From sci.math.symbolic)*From*: maeder at symcom.math.uiuc.edu Tue Mar 21 13:54:43 1989*Date*: Tue, 21 Mar 89 16:01:31 CST

> I have a Mathematica question. I did the following: > > In[1]:= y x . b - E[x . b] > > x.b > Out[1]:= -E + yx.b I don't understand how you got that output from your input. E[expr] gives just that, E[expr]. Didn't you mean E^expr or Exp[expr] ? Is your example a verbatim copy of the session? Roman Maeder maeder at symcom.math.uiuc.edu