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MathGroup Archive 2002

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Calculus`Integration` in Math 4.1 with Win98

  • To: mathgroup at smc.vnet.net
  • Subject: [mg35243] Calculus`Integration` in Math 4.1 with Win98
  • From: "Raf" <r_a_f at yahoo.it>
  • Date: Wed, 3 Jul 2002 05:15:58 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,
Some questions about Calculus`Integration`:
1)
In[1]:= <<Calculus`Integration`
This doesn't work:
In[2]:= Integrate[FractionalPart[t], {t, 0, 5}]
Out[2]= Integrate[FractionalPart[t], {t, 0, 5}]
This works:
In[3]:= Integrate[FractionalPart[t]*Boole[t<Infinity], {t, 0, 5}]
Out[3]= 5/2

Can I avoid to write everytime Boole[t<Infinity] or similar and have the
right answer?

2)
Defining...
In[4]:= ondTri[t_] := 4Abs[t - Floor[t] - 1/2] - 1
This works:
In[5]:= Integrate[ondTri[t]*Boole[t < Infinity], {t, 0, 1/8}]
Out[5]= 3/32
This not:
In[5]:= Integrate[ondTri[t]*Boole[t < Infinity], {t, 0, 0.125}]

Mathematica answers with many error messages ( and sometimes the kernel
crash )
Why?


Thanks,
Raf.









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