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Figure 3 | Advances in Difference Equations

Figure 3

From: Numerical anisotropy in finite differencing

Figure 3

Polar diagram of normalized phase velocities as a function of points per wavelength (PPW) and the direction of propagation. (a) Fourth-order explicit schemes (lowest number of points per wavelength is 4); (b) sixth-order compact schemes (lowest number of points per wavelength is 3).

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