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BUILT-IN MATHEMATICA SYMBOL
ArrayRules
ArrayRules[SparseArray[...]]
gives the rules 
specifying elements in a sparse array.
ArrayRules[list]
gives rules for SparseArray[list].
Details
- The last element of ArrayRules[s] is always
, where def is the default value for unspecified elements in the sparse array. » - ArrayRules[list, val] takes the default value to be val. »
- ArrayRules[list] assumes a default value of 0. »
Examplesopen all
Basic Examples (1)
Get the explicit elements in a SparseArray:
| In[1]:= |
| Out[1]= |  |
| In[2]:= |
| Out[2]= |  |
These rules are sufficient to efficiently construct an identical SparseArray:
| In[3]:= |
| Out[3]= |  |
| In[4]:= |
| Out[4]= |  |
New in 5
