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MathGroup Archive 1995

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Problems with high-dimensional lists

  • To: mathgroup at
  • Subject: [mg2494] Problems with high-dimensional lists
  • From: Sascha at, Unzicker at
  • Date: Wed, 15 Nov 1995 01:57:59 -0500
  • Organization: Universitaet Muenchen (Germany)

Let me give an example:



gives you 
Out[86]= {3, 4, 5, 6},
of course.

But if you try to assign a new value to a sublist
Mathematica forgets that a still should have the Dimension {3,4,5,6}:

In[88]:= Dimensions[a]
Out[88]= {3, 4}
In[89]:= Transpose[a,{4,1,2,3}];

   Permutation {4, 1, 2, 3} is longer than the dimensions {3, 4} of the array.

is now impossible, although 

In[90]:= a[[3,4,5,6]]
Out[90]= 0
returns still the correct value. Why does Mathematica make this difference?
If you print a, there is no difference.

How can you return to the desired Dimension?


is not possible because a[[1,1,1,1]] gives a mess.

Thanks in advance,

Sascha Unzicker

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