Trunc; Tsimp; Unassign - HP 48gII Advanced User's Reference Manual

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TRUNC

Type:
Function
Description:
Truncates a series expansion.
Catalog, ...µ
Access:
Input:
Level 2/Argument 1: The expression that you want to truncate.
Level 1/Argument 2: The expression to truncate with respect to.
Output:
The expression from Level 2/Argument 1, with terms of order greater than or equal to the
order of the expression in Level 1/Argument 2 removed.
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:
Expand the expression (x+1)
Command:
TRUNC((X+1)^7,X^4)
Result:
35*X^3+21*X^2+7*X+1
See also:
DIVPC, EXPAND, SERIES

TSIMP

Type:
Command
Description:
Performs simplifications on expressions involving exponentials and logarithms. Converts base
10 logarithms to natural logarithms
Exponential and logarithms, !Ð L, or ...ÑLL
Access:
Input:
An expression
Output:
The simplified expression.
Flags:
Exact mode must be set (flag –105 clear).
Numeric mode must not be set (flag -3 clear).
Example:
Simplify log(x+x)
Command:
TSIMP(LOG(X+X))
Result:
(LN(2)+LN(X))/(LN(5)+LN(2))
See also:
TEXPAND, TLIN

UNASSIGN

Type:
Command
Description:
Removes global variables and returns their values. This is an algebraic version of the PURGE
command.
Catalog, ...µ
Access:
Input:
Level 1/Item 1: The name of a global variable, or a list of global names, to be purged.
Output:
Level 1/Item 1: The value or list of values that were stored in the now purged variables. If a
variable does not exist, or is not in the current directory path, it is not removed, and its name
is returned.
Flags:
The status of the purge confirm flag (flag –76) is ignored, variables are purged with no request
for confirmation.
Example:
Try to remove the global variable U, which contains 17.5, and the global variable V, which is
not on the current directory path.
, and remove all terms in x
7
Computer Algebra Commands 4-77
and higher powers of x
4

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