mirror of
https://github.com/wassname/simpeg.git
synced 2026-06-28 17:51:19 +08:00
Rowan Cockett
39 lines
1.0 KiB
Python
39 lines
1.0 KiB
Python
from scipy import sparse as sp
|
|
from matutils import mkvc
|
|
import numpy as np
|
|
|
|
|
|
def sdiag(h):
|
|
"""Sparse diagonal matrix"""
|
|
return sp.spdiags(mkvc(h), 0, h.size, h.size, format="csr")
|
|
|
|
|
|
def speye(n):
|
|
"""Sparse identity"""
|
|
return sp.identity(n, format="csr")
|
|
|
|
|
|
def kron3(A, B, C):
|
|
"""Three kron prods"""
|
|
return sp.kron(sp.kron(A, B), C, format="csr")
|
|
|
|
|
|
def spzeros(n1, n2):
|
|
"""spzeros"""
|
|
return sp.coo_matrix((n1, n2)).tocsr()
|
|
|
|
|
|
def ddx(n):
|
|
"""Define 1D derivatives, inner, this means we go from n+1 to n"""
|
|
return sp.spdiags((np.ones((n+1, 1))*[-1, 1]).T, [0, 1], n, n+1, format="csr")
|
|
|
|
|
|
def av(n):
|
|
"""Define 1D averaging operator from nodes to cell-centers."""
|
|
return sp.spdiags((0.5*np.ones((n+1, 1))*[1, 1]).T, [0, 1], n, n+1, format="csr")
|
|
|
|
def avExtrap(n):
|
|
"""Define 1D averaging operator from cell-centers to nodes."""
|
|
Av = sp.spdiags((0.5*np.ones((n, 1))*[1, 1]).T, [-1, 0], n+1, n, format="csr") + sp.csr_matrix(([0.5,0.5],([0,n],[0,n-1])),shape=(n+1,n))
|
|
return Av
|