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

-- ∑ xi ni = 1

where xi is the ith coordinate value in a column, and n is the number of data points.

Access:

…µMEAN 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

 

 

 

 

 

 

 

 

→

xmean

 

 

 

→

[xmean1, xmean2, ..., xmeanm ]

 

 

 

 

See also:

BINS, MAXΣ, MINΣ, SDEV, TOT, VAR

 

 

 

 

 

 

MEM

Command

 

 

Type:

 

 

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.

Abuilt-in menu is specified by a real number xmenu. The format of xmenu 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 (namedefinition). 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

Full Command and Function Reference 3-145