Hi Nafise,
> Dear all, > > Is there any one to know how we can use one element of matrix? For > example we have matrix A as follows: > > A=[2 4;6,0] > > We have A matrix with dimension 2*2. If we want to use one element of > matrix such as A(2,1), (that is number 6 in the matrix), How we can > write in kwant? Any help appreciate. Well it depends what you mean. In Kwant you typically construct your system using a Builder. You can think of this as *analogous* to a sparse matrix where you can index the entries with *pairs of sites* (hoppings) instead of integers. After finalizing a builder you can call 'hamiltonian_submatrix', which will give you an *actual* dense or sparse matrix (depending on whether you pass 'sparse=True' or 'sparse=False'). You can then index this matrix as you would normally. Happy Kwanting, Joe
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