Re: Q:Changing Mathematica default terms arrangement

• To: mathgroup at smc.vnet.net
• Subject: [mg52788] Re: [mg52741] Q:Changing Mathematica default terms arrangement
• From: "David Park" <djmp at earthlink.net>
• Date: Mon, 13 Dec 2004 04:22:46 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

```Diego,

xc[i_] := (xn[i] + xn[i - 1])/2
deno = Factor[(xc[i + 1] - xc[i])]

David Park

From: Diego Luego [mailto:dluego at yahoo.es]
To: mathgroup at smc.vnet.net

Hello,

I am wondering if it is possible to ask Mathematica
the following:

1.- In the output below (Out[7]), instead of the Mathematica
default arrangement of terms in the numerator, I would
like to obtain
xn[1 + i] - xn[i - 1].

In[6]:= xc[i_] := (xn[i] + xn[i-1])/2

In[7]:= deno = Factor[(xc[i+1] - xc[i])]

-xn[-1 + i] + xn[1 + i]
Out[7]= -----------------------
2

2.- I would like to be able to tell Mathematica to show the
answer of output Out[8] in the form
Fc[1 + i] - Fc[i]
-----------------------
xn[1 + i] - xn[i - 1]
-----------------------
2

In[8]:=  a = (Fc[i+1] - Fc[i])/deno

2 (-Fc[i] + Fc[1 + i])
Out[8]= -----------------------
-xn[-1 + i] + xn[1 + i]

Thanks for your help.

Diego

```

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