manual:chapter6:system:cmd_newob [newRPL User Manual]

Synopsis

Replaces a given object with a new copy

Stack Diagram

Input Stack		Output Stack
O	→	O_copy
Level 1	→	Level 1

Legend

Legend	Object type
O	Any object
I	Integer number
R	Real number
#	Binary number
Num	Scalar (Integer, Real or Binary number)
Z	Complex number
U	Unit
∡	Angle
A	Symbolic expression
C	Symbolic constant
V	Vector
M	Matrix
S	String
1/0	Any expression evaluating to True or False
G	Grob
F	Font
D	Binary data container
T	Tag object
L	List
cL	Case list
N	Variable name / Identifier
Dir	Directory
pDir	Packed Directory
P	Program
Lib	Library

Keyword type	Command
Parallel list processing capabilities	Group 9	Quirky commands
Affected by flags	None

Description

The NEWOB command replaces an object on the stack with a new copy of itself.

The command may seem pointless, but it solves a very specific problem: when an object originated from a larger composite object is extracted and put on the stack it contains a reference to the parent object; even if the parent object is DROPped from the stack it keeps on living in the RAM, occupying precious resources.

A copy of the extracted object created by NEWOB breaks this link and allows the GARBAGE collection to recover the memory associated with the larger object once it is not needed anymore.

Compatibility

NEWOB is fully equivalent to its userRPL counterpart.

Usage

Input

4:                                      
3:                                      
2:                                      
1:{ 'LN(X)' 8888. [[ 1 2 3 ] [ 4 5 6 ]]…
…………………………………………………………………………………………………………
3 GET { 2 3 } GET NEWOB

Output

4:                                      
3:                                      
2:                                      
1:                                     6
…………………………………………………………………………………………………………

Related Commands

Time, Alarms and System Commands 28 1 NEW

Command	Short Description
→DATE	Set current system date in MM.DDYYYY
DATE+	Add days to a date in MM.DDYYYY
→TIME	Set current time as HH.MMSS
→HMS	Convert decimal time to HH.MMSS
HMS→	Convert time in HH.MMSS to decimal
HMS+	Add time in HH.MMSS format
HMS-	Subtract time in HH.MMSS format
TICKS	Return system clock in microseconds	CHANGED
TEVAL	Perform EVAL and measure elapsed time	CHANGED
DATE	Current system date as MM.DDYYYY
DDAYS	Number of days between dates in MM.DDYYYY
TIME	Current time in HH.MMSS
TSTR
ACK	Acknowledge oldest alarm (dismiss)
ACKALL	Acknowledge (dismiss) all alarms
RCLALARM	Recall specified alarm
STOALARM	Create a new alarm
DELALARM	Delete an existing alarm
FINDALARM	Get first alarm due after the given time
VERSION	Get newRPL version string
MEM	Get available memory in bytes
BYTES	Size of an object in bytes and CRC32	CHANGED
PEEK	Low-level read memory address	CHANGED
POKE	Low level write to memory address	CHANGED
NEWOB	Make a new copy of the given object
GARBAGE	Force a garbage collection	NEW
FWUPD
OFF	Turn calculator off programmatically