| Author |
Comment/Response |
Bill Simpson
|
 09/07/12 1:24pm
Does this help?
In[1]:= arr=Table[0,{5}];
Do[arr[[i]]=1+0.5 i,{i,1,5}];
Print[Dimensions[arr]];
Print[arr];
From In[1]:= {5}
From In[1]:= {1.5,2.,2.5,3.,3.5}
Mathematica does not automatically create a vector, you must create that with Table[] or other ways.
Mathematica uses [] for functions so it believes arr[i] must be a function named arr with a parameter i and that is probably an error in your notebook.
Mathematica uses [[]] for vector and matrix subscripts so arr[[5]] is the fifth element in vector arr.
Mathematica uses Dimensions[] to return a list of the dimensions so {5} is a vector of lenght 5, {3,7} is a matrix of size 3 by 7, etc.
Mathematica uses Print[] to display results. If there is more than one expression in a cell in a notebook then each expression should be separated by a semicolon. If the last expression in a cell is followed by a semicolon there will be no result displayed. If the last expression in a cell is not followed by a semicolon then that result will be displayed.
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