HP 49g Graphing Calculator - Manual (Page 135)

Example: Find the curl of the following vector function:
2 "I T
(\' = X yi + x~yj + y^zky
Command: CURL ( [ X " 2 * Y ,
X ' ' 2 * Y ,
Y ^ 2 * z ] , [ X , Y , z ] )
Result: [2 * X * Y , , Y ^ 2 ]
See Also: DIV
HESS
DERIV
Type: Function
Description: Returns the partial derivatives of a fimction, with
respect to the specified variables.
Access: Calculus, 0{® DERIV. & INTEG
Input: Level 2/Ai'gument 1: A fimction or a list of fimctions.
Level 1/Argument 2: A variable, or a vector of variables.
Output: The derivative, or a vector of the derivatives, of the
fimction or functions.
Flags: Exact mode must be set (flag -105 clear).
Nmneric mode must not be set (flag -03 clear).
Example: Find the gradient of the following fimction of the spatial
variables x, y, and z:
~>
2x"y + 3y z + zx
Command: DERIV(2*X''2*Y+3*Y^2*Z + Z * X , [ X , Y , Z ] )
EXPAND(ANS
(1))
Result: [ 4 * Y * X + Z , 2 * X ^ 2 + 6 * Z * Y , X + 3 * Y - ^ 2 ]
See also: DERVX
DERVX
Type: Function
Description: Returns the derivative of a fimction with respect to the
current variable.
Access: Calculus, 0(0c) DERIV. & INTEG.
Input: The fimction or list of functions to be differentiated.
Page 14-12 Computer Algebra Commands