Re: What is f[1]? Advanced question

*To*: undisclosed-recipients:;*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*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-outx@smc.vnet.net*Delivered-to*: mathgroup-newsendx@smc.vnet.net*Newsgroups*: comp.soft-sys.math.mathematica*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>