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Series is taking too long
*To*: mathgroup at yoda.physics.unc.edu
*Subject*: Series is taking too long
*From*: Roque Donizete de Oliveira <oliveria at engin.umich.edu>
*Date*: Fri, 22 Jan 93 03:15:27 -0500
There must be something wrong with Series.
It took about 3 seconds to evaluate the first example
below but it never evaluated the second example (I killed
it after 10 minutes). I duplicated the problem many times.
I was the only one using the machine (no background jobs either).
ulam% math
Mathematica 2.1 for DEC RISC
Copyright 1988-92 Wolfram Research, Inc.
-- Terminal graphics initialized --
In[1]:= Series[D[(Pi^(1/2)*(-z^2)^(1/2)*Erf[(-z^2)^(1/2)])/(E^z^2*z),z],{z,0,7}]
Series[D[(Pi^(1/2)*(-z^2)^(1/2)*Erf[(-z^2)^(1/2)])/(E^z^2*z),z],{z,0,7}]
4 6
2 8 z 16 z 8
Out[1]= -2 + 4 z - ---- + ----- + O[z]
3 15
In[2]:= Series[D[(Pi^(1/2)*(-z^2)^(1/2)*Erf[(-z^2)^(1/2)])/(E^z^2*z),z],{z,0,9}]
Series[D[(Pi^(1/2)*(-z^2)^(1/2)*Erf[(-z^2)^(1/2)])/(E^z^2*z),z],{z,0,9}]
Thanks for any help.
Roque
oliveria at engin.umich.edu
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