x

$x_{i-2}$

$x_{i-1}$

$x_i$

$x_{i+1}$

$x_{i+2}$

${\phi }_i\left(x\right)$

0

1

4

1

0

${{\phi }^{\prime }}_i\left(x\right)$

0

3/h

0

−3/h

0

${{\phi }^{″}}_i\left(x\right)$

0

6/h²

−12/h²

6/h²

0