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VECTOR CALCULUS

ALGEBRA

BASIC

CALCULUS

CAS

DATA

ELEMENTARY

GRAPHING

MANUAL

MATRIX

NUMBER

PLOT

SCRIPTING

SPECIAL

SPECIAL POLYNOMIALS

STATISTICAL

TRIGONOMETRIC
  Duf(function, [varlist], [point], [direction])
[varlist]
If no value is given the default value is [x,y,z].

[point]
If given the directional derivative is calculated at that point. If not, then [x, y, z] is used.

[direction]
If given the derivative is calculated at the given point in the direction of the given vector. If no direction is given the vector [1, 1, 1] is assumed.


Description
Calculates the directional derivative of a given function.


Examples  








References
http://mathworld.wolfram.com/DirectionalDerivative.html
http://en.wikipedia.org/wiki/Directional_derivative




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