SparseArray

SparseArray[{pos1->v1,pos2->v2,…}] yields a sparse array with all elements zero except for values vi at positions posi.

SparseArray[list] yields a sparse array version of list. 

SparseArray[data,{d1,d2,…}] yields a sparse array representing a d1×d2×… array. 

SparseArray[data,dims,val] yields a sparse array in which unspecified elements are taken to have value val. 

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