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 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. URL: ,

 Subject (listing for 'print and dimensions') Author Date Posted print and dimensions phuyer Chen 09/07/12 10:23am Re: print and dimensions Bill Simpson 09/07/12 1:24pm
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