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Topic: What is f[1]? Advanced question
Replies: 9   Last Post: Jul 1, 2013 5:45 AM

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Louis Talman

Posts: 5,100
Registered: 12/27/05
Re: What is f[1]? Advanced question
Posted: Jun 28, 2013 3:49 AM
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On Tue, 25 Jun 2013 19:14:08 -0600, amannucci
<> 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


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