Reference Guide
Full Command and Function Reference 3-145
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 ΣDAT).
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:
1
n
---
x
i
i 1=
n
∑
where x
i
is the ith coordinate value in a column, and n is the number of data points.
Access: …µ
MEAN OR
…ÙSingle-variable statistics, Mean
(Ùis the right-shift of the 5key and always invokes a choose box).
Input/Output:
Level 1/Argument 1 Level 1/Item 1
→
x
mean
→
[x
mean1
, x
mean2
, ..., x
meanm
]
See also: BINS, MAXΣ, MINΣ, 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: !°
MEMORY MEM
( °is the left-shift of the Nkey).
Input/Output:
Level 1/Argument 1 Level 1/Item 1
→
x
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.
A built-in menu is specified by a real number x
menu
. The format of x
menu
is mm.pp, where mm is the
menu number and pp is the page of the menu. If pp doesn’t correspond to a page of the specified
menu, the first page is displayed.
Library menus are specified in the same way as built-in menus, with the library number serving as
the menu number.
Custom menus are specified by a list of the form { "label-object" action-object } or a name containing
a list (name
definition
). Either argument is stored in reserved variable CST, and the custom menu is
subsequently displayed.
MENU takes any object as a valid argument and stores it in CST. However, the calculator can
build a custom menu only if CST contains a list or a name containing a list. Thus, if an object other