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What is f[1]? Advanced question
*To*: mathgroup at smc.vnet.net
*Subject*: [mg131300] What is f[1]? Advanced question
*From*: amannucci <Anthony.J.Mannucci at jpl.nasa.gov>
*Date*: Tue, 25 Jun 2013 21:14:08 -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
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.
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