Sony Tektronix VX4792 User Manual page 277

Appendix G: Functions
G-2
f(x
f(x )
i-1
nx
x
i
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
) ) 4f (x
n{–3f (x
) [
1 2
f (x
1
2
Last point
) ) 3f (x
n{f (x )–4f (x
) [
n–2 n–1
f (x
n
2
)
i
f(x )
i+1
nx
)–f (x )}
3
)}
n
x
n
VX4792 User Manual