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The function used in library initialization is wderiv_init_Nd, where N is a space dimension:

Initialization functions:

int wderiv_init_3d(int nx, int ny, int nz, double dx, double dy, double dz)

• nx number of points in first dimension
• ny number of points in second dimension
• nz number of points in third dimension
• dx lattice constant in first dimension
• dy lattice constant in second dimension
• dz lattice constant in third dimension

Analogicly for 2D...

int wderiv_init_2d(int nx, int ny, double dx, double dy)

...and 1D problems.

int wderiv_init_1d(int nx, double dx)