(4.86)

where ${r}_{I}$ is the radius of a basic circular support. The radius ${r}_{I}$ is determined by searching for sufficient adjacent nodes to satisfy the basis. For example, we can designate the support to cover just the three nearest neighboring nodes.

The size of a rectangular support can be defined by

$\{\begin{array}{c}{a}_{1I}={D}_{\mathrm{max}}{c}_{1I}\\ {a}_{2I}={D}_{\mathrm{max}}{c}_{2I}\end{array},I=1,\dots ,n,$ (4.87)

(4.87)

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