Dataplot Vol 2 Vol 1

# MATRIX MEAN

Name:
MATRIX MEAN (LET)
Type:
Let Subcommand
Purpose:
Compute the overall mean of a matrix.
Description:
The overall mean of the matrix is the mean of all the data in the matrix.
Syntax:
LET <par> = MATRIX MEAN <mat>             <SUBSET/EXCEPT/FOR qualification>
where <mat> is a matrix for which the mean is to be computed;
<par> is a parameter where the resulting mean is saved;
and where the <SUBSET/EXCEPT/FOR qualification> is optional.
Examples:
LET MMEAN = MATRIX MEAN M
LET MMEAN = MATRIX MEAN M SUBSET TAG = 1
Note:
Matrices are created with either the READ MATRIX command or the MATRIX DEFINITION command. Enter HELP MATRIX DEFINITION and HELP READ MATRIX for details.
Note:
Row and column statistics for a matrix can be computed using the MATRIX ROW STATISTIC and MATRIX COLUMN STATISTIC commands. Enter HELP MATRIX ROW STATISTIC and HELP MATRIX COLUMN STATISTIC for details.
Default:
None
Synonyms:
None
Related Commands:
 MATRIX COLUMN STATISTIC = Compute column statistics for a matrix. MATRIX ROW STATISTIC = Compute row statistics for a matrix. MATRIX COLUMN DIMENSION = Dimension maximum number of columns for Dataplot matrices.
Reference:
"Applied Multivariate Statistical Analysis", Third Edition, Johnson and Wichern, Prentice-Hall, 1992.
Applications:
Multivariate Analysis
Implementation Date:
1998/8
Program:
SKIP 25
READ IRIS.DAT Y1 Y2 Y3 Y4
LET N = SIZE Y1
LET M = MATRIX DEFINITION Y1 N 4
LET A = MATRIX MEAN M

Date created: 6/5/2001
Last updated: 4/4/2003