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Appendix F: Miscellaneous
FĆ4
AWG2021 User Manual
f(x
i
)
x
i
x
n
nx
f(x
i+1
)
f(x
i-1
)
nx
Figure FĆ4: Equation Differentiation
The values at the first and last points are obtained not from the center deviation,
but from the following equations:
First point
fȀ(x
1
) [
n
{
–3f (x
1
) ) 4f (x
2
)–f (x
3
)
}
2
Last point
fȀ(x
n
) [
n
{
f (x
n–2
)–4f (x
n–1
) ) 3f(x
n
)
}
2