Mean; Mem; Menu - HP 48gII Advanced User's Reference Manual

Input/Output:
See also: MUSER

MEAN

Type: Command
Description: Mean Command: Returns the mean of each of the m columns of coordinate values in the current
statistics matrix (reserved variable DAT).
The mean is returned as a vector of m real numbers, or as a single real number if m = 1. The
mean is computed from the formula:
where x is the ith coordinate value in a column, and n is the number of data points.
i
...µ
Access:
(Ùis the right-shift of the 5key and always invokes a choose box).
Input/Output:
See also: BINS, MAX , MIN , SDEV, TOT, VAR

MEM

Type: Command
Description: Memory Available Command: Returns the number of bytes of available RAM.
The number returned is only a rough indicator of usable available memory, since recovery
features (LASTARG= !î, ...¯, and !®) consume or release varying
amounts of memory with each operation.
Before it can assess the amount of memory available, MEM must remove objects in temporary
memory that are no longer being used. This clean-up process (also called "garbage collection")
also occurs automatically at other times when memory is full. Since this process can slow down
calculator operation at undesired times, you can force it to occur at a desired time by executing
MEM. In a program, execute MEM DROP.
!°
Access:
Input/Output:
See also: BYTES

MENU

Type: Command Operation
Description: Display Menu Command: Displays a built-in menu or a library menu, or defines and displays a
custom menu.
Level 1/Argument 1
'name'
{ list }
"ALL"
...ÙSingle-variable statistics, Mean
MEAN OR
Level 1/Argument 1
MEMORY MEM
Level 1/Argument 1
n
1
∑
x
-- -
i
n
i = 1
( °is the left-shift of the Nkey).
Full Command and Function Reference 3-103
Level 1/Item 1
Level 1/Item 1
x
mean
[x , x , ..., x ]
mean1 mean2 meanm
Level 1/Item 1
x