[eigen] Complexity of setFromTriplets

[coryaden@xxxxxxxxxx]

Hello,

in the documentation of the class Eigen::SparseMatrix< _Scalar, 
_Options, _Index > it is claimed that the function setFromTriplets was a 
"O(n) operation, with n the number of triplet elements".
O(n) suggests that the matrix dimensions do not effect execution time, 
which is wrong. It should be O(n+r+c), with n number of triplets and r,c 
the number of rows and columns of the SparseMatrix<>.

Cory Aden