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NAME

v.univar - Calculates univariate statistics for attribute. Variance and standard deviation is calculated only for points if specified

KEYWORDS

vector

SYNOPSIS

v.univar
v.univar help
v.univar [-g] map=name [type=string[,string,...]] column=string [where=sql_query] [layer=integer]

Flags:

-g
Print the stats in shell script style

Parameters:

map=name
Name of input vector map
type=string[,string,...]
Type
Options: point,line,boundary,centroid,area
Default: point,line,boundary,centroid,area
column=string
Column name
where=sql_query
WHERE conditions of SQL statement without 'where' keyword. (example: income < 1000 and inhab >= 10000)
layer=integer
Layer number
Default: 1

DESCRIPTION

v.univar calculates univariate statistics of vector map features. This includes the number of features counted, minimum and maximum values, and range. Variance and standard deviation is calculated only for points if type=point is defined.

EXAMPLE

g.region rast=elevation.10m -p
v.random out=samples n=100
v.db.addtable samples col="heights double precision"
v.what.rast samples rast=elevation.10m col=heights
v.db.select samples

v.univar samples col=heights type=point

SEE ALSO

v.neighbors

AUTHOR

Radim Blazek, ITC-irst

Last changed: $Date: 2005/12/28 21:32:42 $

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