Reference Guide

3-270 Full Command and Function Reference
The variance (equal to the square of the standard deviation) is returned as a vector of m real
numbers, or as a single real number if m = 1. The variances are computed using this formula:
1
n 1–
------------
x
i
x–( )
2
i 1=
n
∑
⋅
where x
i
is the ith coordinate value in a column,
x
is the mean of the data in this column, and n is
the number of data points.
Access: …µ VAR
Input/Output:
Level 1/Argument 1 Level 1/Item 1
→
x
variance
→
[ x
variance1
, ..., x
variancem
]
See also: MAXΣ, MEAN, MINΣ, PSDEV, PVAR, SDEV, TOT
VARS
Type: Command
Description: Variables Command: Returns a list of the names of all variables in the VAR menu for the current
directory.
Access: !° MEMORY DIRECTORY L VARS ( °is the left-shift of the Nkey).
Input/Output:
Level 1/Argument 1 Level 1/Item 1
→
{ global
1
... global
n
}
See also: ORDER, PVARS, TVARS
VER
Type: Command
Description: Returns the Computer Algebra System version number, and date of release.
Access: Catalog, …µ
Input: No input required.
Output: A real number giving the version and release date of the Computer Algebra System software.
Flags: The version and release date are given as a number of the form V.YYYYMMDD, so a display
mode showing at least 8 digits after the fraction mark is needed to display the result in full.
VERSION
Type: Command
Description: Software Version Command: Displays the software version and copyright message.
Access: …µ VERSION
Input/Output:
Level 1/Argument 1 Level 2/Item 1 Level 1/Item 2
→
“version number” “copyright message”