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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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Tomas Garza Hernandez

Posts: 264
Registered: 4/15/05
Re: What is f[1]? Advanced question
Posted: Jun 26, 2013 12:59 AM
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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@jpl.nasa.gov
> Subject: What is f[1]? Advanced question
> To: mathgroup@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.
>






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