Nderiv – Texas Instruments TI-83 PLUS User Manual

Page 73

Advertising
background image

TI-83 Plus

Math, Angle, and Test Operations

70

nDeriv(

nDeriv(

(numerical derivative) returns an approximate derivative of

expression

with respect to

variable

, given the

value

at which to calculate the

derivative and

H

(if not specified, the default is 1

âL

3).

nDeriv(

is valid only

for real numbers.

nDeriv(

expression

,

variable

,

value

[

,

H

]

)

nDeriv(

uses the symmetric difference quotient method, which

approximates the numerical derivative value as the slope of the secant
line through these points.

ε

ε

ε

2

)

(

(

)

(

)

(

'

+

=

x

f

x

f

x

f

As

H

becomes smaller, the approximation usually becomes more

accurate.

You can use

nDeriv(

once in

expression

. Because of the method used to

calculate

nDeriv(

, the

TI-83 Plus

can return a false derivative value at a

nondifferentiable point.

Advertising
This manual is related to the following products: