ConstantArray and List
- To: mathgroup at smc.vnet.net
- Subject: [mg88156] ConstantArray and List
- From: Szabolcs Horvát <szhorvat at gmail.com>
- Date: Sat, 26 Apr 2008 03:46:00 -0400 (EDT)
- Organization: University of Bergen
Consider the following inputs:
In[1]:= ConstantArray[f[], {5}]
Out[1]= {f[], f[], f[], f[], f[]}
In[2]:= ConstantArray[List[], {5}]
During evaluation of In[2]:= ConstantArray::scalar: Argument {} at \
position 1 is not a scalar. >>
Out[2]= ConstantArray[{}, {5}]
Why doesn't the second one work? Is this because of the way packed
arrays are handled (just a guess)?
What is the advantage of ConstantArray over Table or Array? It doesn't
seem to be much faster, and it doesn't seem to return an array stored in
a more efficient way (I experimented a little with MemoryInUse[]).
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