Reference Guide

Full Command and Function Reference 3-127
LAP
Type: Function
Description: Performs a Laplace transform on an expression with respect to the current default variable.
Access: Calculus, !Ö DIFFERENTIAL EQNS
Input: An expression.
Output: The Laplace transform of the expression.
Flags: Exact mode must be set (flag –105 clear).
Numeric mode must not be set (flag –3 clear).
Radians mode must be set (flag –17 set).
Example: Find the Laplace transform of e
x
.
Command: LAP(EXP(X))
Result: 1/(X-1)
See also: ILAP, LAPL
LAPL
Type: Command
Description: Returns the Laplacian of a function with respect to a list of variables.
Access: !Ö DERIV & INTEG L
Input: Level 2/Argument 1:An expression.
Level 1/Argument 2: A vector of variables.
Output: The Laplacian of the expression with respect to the variables.
Flags: Exact mode must be set (flag –105 clear).
Numeric mode must not be set (flag –3 clear).
Radians mode must be set (flag –17 set).
Example: Find, and simplify, the Laplacian of the following expression:
e
x
zy ( ) cos
Command: LAPL(EXP(X)*COS(Z*Y),[X,Y,Z])
EXPAND(ANS(1))
Result: -((Y^2+Z^2-1)*EXP(X)*COS(Z*Y))
See also: LAP, ILAP
LAST
Type: Command
Description: Returns copies of the arguments of the most recently executed command.
LAST is provided for compatibility with the HP 28S. LAST is the same as LASTARG.
Access: None. Must be typed in.
Flags: Last Arguments (–55)
Input/Output:
Level 1 Level n  Level 1
→
obj
n
… obj
1
See also: ANS, LASTARG