Sony Tektronix VX4792 - Page 277

Appendix G: Functions
G-2
VX4792 User Manual
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Figure G-1: 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