Re: What is f[1]? Advanced question

*To*: mathgroup at smc.vnet.net*Subject*: [mg131305] Re: What is f[1]? Advanced question*From*: Tomas Garza <tgarza10 at msn.com>*Date*: Wed, 26 Jun 2013 01:03:10 -0400 (EDT)*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*References*: <20130626011408.DC7E86A2B@smc.vnet.net>

It is possibly a previously declared "Array" with the name "x", and the three lines are assigning values to the elements of the array. Check for Array in the Help. -Tomas > From: Anthony.J.Mannucci at jpl.nasa.gov > Subject: What is f[1]? Advanced question > To: mathgroup at smc.vnet.net > Date: Tue, 25 Jun 2013 21:14:08 -0400 > > 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 > > the answer is just what I have written above. Mathematica knows about x[1], x[2], etc. How does Mathematica know about the "elements" of x? > > In some other sense, I could have written: > y1 = 0.1 > y2 = 0.2 > y3 = 0.3 > > But > ?y > > obviously gives a different result (just returns y). > > Thank you. >

**References**:**What is f[1]? Advanced question***From:*amannucci <Anthony.J.Mannucci@jpl.nasa.gov>