SimPEG.utils.ddx

SimPEG.utils.ddx(n)

Create 1D difference (derivative) operator from nodes to centers.

For n cells, the 1D difference (derivative) operator from nodes to centers is sparse, has shape (n, n+1) and takes the form:

$$\begin{array}{r}\begin{array}{c}\left[\begin{array}{ccccc}-1& 1& & & \\ & -1& 1& & \\ & & \ddots & \ddots & \\ & & & -1& 1\end{array}\right]\end{array}\end{array}$$

Parameters

nint

Number of cells

Returns

(n, n + 1) scipy.sparse.csr_matrix

The 1D difference operator from nodes to centers.