Mathematica and Matrices (From sci.math.symbolic)
- To: mathgroup
- Subject: Mathematica and Matrices (From sci.math.symbolic)
- From: stevec (Steve Christensen)
- Date: Mon, 20 Mar 89 13:49:01 CST
gmk Mathematica and matrices 9:25 pm Mar 16, 1989(at wjh12.harvard.edu) (From News system)
I have a Mathematica question. I did the following:
In[1]:= y x . b - E[x . b]
x.b
Out[1]:= -E + yx.b
In[2]:= D[%,b]
x.b
Out[2]:= -(E (0.b + x.1)) + y(0.b + x.1)
Of course, this answer is right, but I would prefer if Mathematica
knew that 0.b=0 and x.1=1, so that the above equation would be
written as follows:
x.b
-x E + yx
Does anyone know how to get Mathematica to do this?
Thanks in advance
Gary King
...........
: Gary King, Department of Government, Harvard University, Cambridge, MA 02138
harvard.edu, BITnet: gmk at harvunxw, Phone: 617-495-2027