1r3.univar(1)                  Grass User's Manual                 r3.univar(1)
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NAME

6       r3.univar   -  Calculates  univariate  statistics  from the non-null 3d
7       cells of a raster3d map.
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KEYWORDS

10       raster3d, statistics
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SYNOPSIS

13       r3.univar
14       r3.univar help
15       r3.univar   [-ge]   input=name    [percentile=integer]      [--verbose]
16       [--quiet]
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18   Flags:
19       -g
20           Print the stats in shell script style
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22       -e
23           Calculate extended statistics
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25       --verbose
26           Verbose module output
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28       --quiet
29           Quiet module output
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31   Parameters:
32       input=name
33           Name of input raster3d map
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35       percentile=integer
36           Percentile to calculate (requires extended statistics flag)
37           Options: 0-100
38           Default: 90
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DESCRIPTION

41       r3.univar calculates the univariate statistics for raster3d maps.  This
42       includes the number of cells counted, minimum and maximum cell  values,
43       range,  arithmetic  mean,  population variance, standard deviation, and
44       coefficient of variation.  If the -e extended statistics flag is  given
45       the 1st quartile, median, 3rd quartile, and given percentile are calcu‐
46       lated.  If the -g flag is given the results are presented in  a  format
47       suitable for use in a shell script.
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NOTES

50       As  with  most  GRASS  raster3d modules, r3.univar operates on the cell
51       array defined by the current  3d  region  settings,  not  the  original
52       extent and resolution of the input map. See g.region.
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54       This module can use large amounts of system memory when the -e extended
55       statistics flag is used with a very large region setting. If the region
56       is too large the module should exit gracefully with a memory allocation
57       error. Basic statistics can be calculated using any size input region.
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TODO

60       mode, skewness, kurtosis
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SEE ALSO

63        g.region
64       r.univar
65       r.univar.sh
66       r.average
67       r.median
68       r.mode
69       r.sum
70       r.series
71       r.stats
72       r.statistics
73       v.univar
74       v.univar.sh
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AUTHORS

78       Soeren Gebbert
79       Code is based on r.univar from
80       Hamish Bowman, Otago University, New Zealand
81       and Martin Landa
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83       Last changed: $Date: 2007-04-06 21:49:26 +0200 (Fri, 06 Apr 2007) $
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85       Full index
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87       © 2003-2008 GRASS Development Team
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91GRASS 6.3.0                                                       r3.univar(1)
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