CASTI-89 TITANIUM · CALC89
nDeriv(
Approximates the derivative of an expression numerically with a central difference quotient.
Syntax
nDeriv(expr, var[, h])
- Group
- Calculus
- Arguments
- Takes the expression, the variable and an optional step size h.
- Availability
- Included
- Menu path
- F3 Calc ▸ nDeriv(
Example
| Input | Result |
|---|---|
| nDeriv(x^3,x)|x=2 | 12.0 |
Typing nDeriv(x^3,x)|x=2 on the home screen and pressing ENTER returns 12.0.
Keystrokes on the TI-89 Titanium
F39
The same key sequence inserts nDeriv( in Calc89, and the AI tutor shows it step by step on the on-screen keypad.
Related commands
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- nfMin(Finds the location of a minimum of an expression numerically within an interval.
- nInt(Approximates a definite integral numerically.
- normalLine(Returns the equation of the normal line to the graph of an expression at a point, the line perpendicular to the tangent.
- rk23(Solves a differential equation numerically with an adaptive Runge Kutta method and returns a matrix with the variable values in the first row and the solution values in the second.
- series(Returns a power series expansion of an expression up to a given order.
- tangentLine(Returns the equation of the tangent line to the graph of an expression at a point.