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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
Please email comments on this WWW page to alan.heckert@nist.gov.