Re: What is f[1]? Advanced question

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• Subject: [mg131333] Re: What is f[1]? Advanced question
• From: Tomas Garza <tgarza10 at msn.com>
• Date: Sat, 29 Jun 2013 04:55:30 -0400 (EDT)
• Approved: Steven M. Christensen <steve@smc.vnet.net>, Moderator
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• References:

```In[2]:= Array[x, 3]

Out[2]= {x[1], x[2], x[3]}

x is an array and is indexed with single brackets (cf. the Help browser).
-Tomas

> From: talmanl at gmail.com
> Subject: Re: What is f[1]? Advanced question
> To: mathgroup at smc.vnet.net
> Date: Fri, 28 Jun 2013 04:15:13 -0400
>
> On Tue, 25 Jun 2013 19:14:08 -0600, amannucci
> <Anthony.J.Mannucci at jpl.nasa.gov> wrote:
>
> > I have found a Mathematica program with the following construct:
> > x[1]=0.1
> > x[2]=0.2
> > x[3]=0.3
> > or
> > Do[x[i]=i/10.,{i,1,3}]
> > x is not a function. It is not a list. What is it? If I query x thus:
> > ?x
>
> x most certainly *is* a function.  Its a function whose domain contains
> just the three numbers 1, 2, and 3.
>
> And it is *not* an array.  Mathematica has lists, which it uses as arrays
> on occasion. An array, y, is indexed with double brackets:  a[[1]],
> a[[2]], etc.
>
> --Louis A. Talman
>    Department of Mathematical and Computer Sciences
>    Metropolitan State University of Denver
>
>    <http://rowdy.msudenver.edu/~talmanl>

```

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