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MathGroup Archive 2012

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Why does the order of down values come back?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg124781] Why does the order of down values come back?
  • From: Shizu <slivo.vitz at msa.hinet.net>
  • Date: Mon, 6 Feb 2012 02:38:08 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

In[]:= f[0] := 0;f[1] := 1;f[n_] := f[n - 1] + f[n - 2]

In[]:= DownValues[f]
Out[]:= {HoldPattern[f[0]] :> 0, HoldPattern[f[1]] :> 1, HoldPattern[f[n_]] :> f[n - 1] + f[n - 2]}

In[]:= DownValues[f] = Reverse[DownValues[f]]
Out[]:= {HoldPattern[f[n_]] :> f[n - 1] + f[n - 2], HoldPattern[f[1]] :> 1, HoldPattern[f[0]] :> 0}

In[]:= DownValues[f]
Out[]:= {HoldPattern[f[0]] :> 0, HoldPattern[f[1]] :> 1, HoldPattern[f[n_]] :> f[n - 1] + f[n - 2]}

====================================================
My question is:  

    Why does the order of down values comes back after reordering?

Thanks.



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