[GRASS-stats] rgrass7 read/write SpatialPolygonsDataFrames errors
Roger Bivand
Roger.Bivand at nhh.no
Sat Oct 10 06:56:22 PDT 2015
OK, thanks. So the failure is in:
vinfo0 <- execGRASS("v.info", flags="c", map="<name>", layer=1L,
intern=TRUE)
used to return the column/field names. Please repeat with that.
Roger
On Fri, 9 Oct 2015, Eduardo Diez wrote:
> Here are the traceback and the vInfo(zm.gnrl). The latter seems to work
> fine.
>
>> zm.fnl <- readVECT(zm.gnrl)
> Error in scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings,
> :
> line 4 did not have 2 elements
>> traceback()
> 8: scan(file = file, what = what, sep = sep, quote = quote, dec = dec,
> nmax = nrows, skip = 0, na.strings = na.strings, quiet = TRUE,
> fill = fill, strip.white = strip.white, blank.lines.skip =
> blank.lines.skip,
> multi.line = FALSE, comment.char = comment.char, allowEscapes =
> allowEscapes,
> flush = flush, encoding = encoding, skipNul = skipNul)
> 7: read.table(con, header = FALSE, sep = "|")
> 6: vColumns(vname)
> 5: nchar(as.character(vColumns(vname)$name))
> 4: .read_vect_non_plugin(vname = vname, layer = layer, type = type,
> remove.duplicates = remove.duplicates, ignore.stderr =
> ignore.stderr,
> pointDropZ = pointDropZ, driver = driver, with_prj = with_prj,
> with_c = with_c)
> 3: tryCatchList(expr, classes, parentenv, handlers)
> 2: tryCatch({
> stopifnot(is.logical(plugin) || is.null(plugin))
> stopifnot(is.logical(ignore.stderr))
> if (missing(layer))
> layer <- 1L
> layer <- as.character(layer)
> stopifnot(is.logical(with_c))
> if (!is.null(driver) && driver == "GRASS")
> plugin <- TRUE
> if (!requireNamespace("rgdal", quietly = TRUE)) {
> stop("rgdal not available")
> }
> if (is.null(plugin)) {
> ogrD <- rgdal::ogrDrivers()$name
> plugin <- "GRASS" %in% ogrD
> }
> if (plugin) {
> res <- .read_vect_plugin(vname = vname, layer = layer,
> type = type, ignore.stderr = ignore.stderr, pointDropZ =
> pointDropZ,
> mapset = mapset)
> }
> else {
> res <- .read_vect_non_plugin(vname = vname, layer = layer,
> type = type, remove.duplicates = remove.duplicates,
> ignore.stderr = ignore.stderr, pointDropZ = pointDropZ,
> driver = driver, with_prj = with_prj, with_c = with_c)
> }
> }, finally = {
> if (get.suppressEchoCmdInFuncOption()) {
> tull <- set.echoCmdOption(inEchoCmd)
> }
> })
> 1: readVECT(zm.gnrl)
>> vInfo(zm.gnrl)
> nodes points lines boundaries centroids areas
> islands primitives map3d
> 274 0 0 302 31 31
> 3 333 0
>
> Thanks
>
>
> 2015-10-09 11:36 GMT-03:00 Roger Bivand <Roger.Bivand at nhh.no>:
>
>> If it is the v.info call, please run:
>>
>> res <- execGRASS("v.info", flags="t", map="zm.gnrl", layer=1L,
>> intern=TRUE)
>>
>> and report the output of:
>>
>> print(res)
>>
>> and maybe send me offlist the output of
>>
>> save(res, file="vinfo_odd_output.RData")
>>
>> Roger
>>
>> --
>> Roger Bivand
>> Norwegian School of Economics
>> Helleveien 30, 5045 Bergen, Norway
>> Roger.Bivand at nhh.no
>>
>>
>> ________________________________________
>> Fra: grass-stats [grass-stats-bounces at lists.osgeo.org] på vegne av
>> Roger Bivand [Roger.Bivand at nhh.no]
>> Sendt: 9. oktober 2015 4:27
>> Til: Eduardo Diez
>> Kopi: grass-stats at lists.osgeo.org
>> Emne: Re: [GRASS-stats] rgrass7 read/write SpatialPolygonsDataFrames errors
>>
>> OK, please provide the output of traceback() run immediately after the
>> failing readVECT(). That will show which command invokes scan(). Also try
>> to run vInfo(zm.gnrl) - I think the failure is in:
>>
>> execGRASS("v.info", flags="t", map="zm.gnrl", layer=1L)
>>
>> not returning a structure that vInfo understands, and which ois then used
>> in readVECT().
>>
>> Roger
>>
>> --
>> Roger Bivand
>> Norwegian School of Economics
>> Helleveien 30, 5045 Bergen, Norway
>> Roger.Bivand at nhh.no
>>
>>
>>
>>
>>
>>
>>
>> Fra: diez.edu at gmail.com [diez.edu at gmail.com] på vegne av Eduardo Diez [
>> eduardodiez at gmx.com]
>>
>> Sendt: 9. oktober 2015 4:04
>>
>> Til: Roger Bivand
>>
>> Kopi: grass-stats at lists.osgeo.org
>>
>> Emne: Re: [GRASS-stats] rgrass7 read/write SpatialPolygonsDataFrames errors
>>
>>
>>
>>
>>
>>
>> Roger, with GRASS version 7.0.1 and rgrass7_0.1-3, readVECT now doesn't
>> ask for the driver to use but gives the same error as before:
>>
>>
>>
>>
>> writeVECT(SDF = mz.pol, vname = zm.pol, v.in.ogr_flags = "o")
>> Over-riding projection check
>> Check if OGR layer <q7468fb> contains polygons...
>>
>>
>>
>> Importing 205 features (OGR layer <q7468fb>)...
>>
>>
>>
>> -----------------------------------------------------
>> Registering primitives...
>> 3924 primitives registered
>> 12866 vertices registered
>> Number of nodes: 2884
>> Number of primitives: 3924
>> Number of points: 0
>> Number of lines: 0
>> Number of boundaries: 3924
>> Number of centroids: 0
>> Number of areas: -
>> Number of isles: -
>> -----------------------------------------------------
>> Cleaning polygons
>> -----------------------------------------------------
>> Breaking polygons...
>> Breaking polygons (pass 1: select break points)...
>>
>>
>>
>> Breaking polygons (pass 2: break at selected points)...
>>
>>
>>
>> -----------------------------------------------------
>> Removing duplicates...
>>
>>
>>
>> -----------------------------------------------------
>> Breaking boundaries...
>>
>>
>>
>> -----------------------------------------------------
>> Removing duplicates...
>>
>>
>>
>> -----------------------------------------------------
>> Cleaning boundaries at nodes...
>>
>>
>>
>> -----------------------------------------------------
>> Merging boundaries...
>>
>>
>>
>> -----------------------------------------------------
>> Removing dangles...
>>
>>
>>
>> -----------------------------------------------------
>> Building areas...
>>
>>
>>
>> 205 areas built
>> 13 isles built
>> Number of nodes: 2929
>> Number of primitives: 7268
>> Number of points: 0
>> Number of lines: 0
>> Number of boundaries: 7268
>> Number of centroids: 0
>> Number of areas: 205
>> Number of isles: 13
>> -----------------------------------------------------
>> Removing bridges...
>>
>>
>>
>> -----------------------------------------------------
>> Registering primitives...
>> 498 primitives registered
>> 5828 vertices registered
>> Building areas...
>>
>>
>>
>> 205 areas built
>> 13 isles built
>> Attaching islands...
>>
>>
>>
>> Number of nodes: 306
>> Number of primitives: 498
>> Number of points: 0
>> Number of lines: 0
>> Number of boundaries: 498
>> Number of centroids: 0
>> Number of areas: 205
>> Number of isles: 13
>> -----------------------------------------------------
>> Finding centroids for OGR layer <q7468fb>...
>>
>>
>>
>> -----------------------------------------------------
>> Writing centroids...
>>
>>
>>
>> -----------------------------------------------------
>> 205 input polygons
>> Total area: 1.25187E+006 (205 areas)
>> -----------------------------------------------------
>> Copying features...
>>
>>
>>
>> WARNING: Unable to delete file
>>
>> 'C:/Users/ediez1/AppData/Local/Temp/Rtmpqkeay4/file480c1e5e16a7/file480c11cc233b/.tmp/unknown/vector/tmp_8308/coor'
>> Building topology for vector map <q7468fb at file480c11cc233b>...
>> Registering primitives...
>> 703 primitives registered
>> 6033 vertices registered
>> Building areas...
>>
>>
>>
>> 205 areas built
>> 13 isles built
>> Attaching islands...
>>
>>
>>
>> Attaching centroids...
>>
>>
>>
>> Number of nodes: 306
>> Number of primitives: 703
>> Number of points: 0
>> Number of lines: 0
>> Number of boundaries: 498
>> Number of centroids: 205
>> Number of areas: 205
>> Number of isles: 13
>>> execGRASS("v.clean", flags = c("overwrite"), input = zm.pol,
>> + output = zm.gnrl, tool = "rmarea", threshold = 3000)
>> --------------------------------------------------
>> Tool: Threshold
>> Remove small areas: 3000
>> --------------------------------------------------
>> Copying features...
>>
>>
>>
>> Rebuilding parts of topology...
>> Building topology for vector map <u10f44b at file480c11cc233b>...
>> Registering primitives...
>> 703 primitives registered
>> 6033 vertices registered
>> Building areas...
>>
>>
>>
>> 205 areas built
>> 13 isles built
>> Attaching islands...
>>
>>
>>
>> Attaching centroids...
>>
>>
>>
>> Number of nodes: 306
>> Number of primitives: 703
>> Number of points: 0
>> Number of lines: 0
>> Number of boundaries: 498
>> Number of centroids: 205
>> Number of areas: 205
>> Number of isles: 13
>> --------------------------------------------------
>> Tool: Remove small areas
>>
>>
>>
>> 174 areas of total size 50601.7 removed
>> --------------------------------------------------
>> Rebuilding topology for output vector map...
>> Building topology for vector map <u10f44b at file480c11cc233b>...
>> Registering primitives...
>> 333 primitives registered
>> 4705 vertices registered
>> Building areas...
>>
>>
>>
>> 31 areas built
>> 3 isles built
>> Attaching islands...
>>
>>
>>
>> Attaching centroids...
>>
>>
>>
>> Number of nodes: 274
>> Number of primitives: 333
>> Number of points: 0
>> Number of lines: 0
>> Number of boundaries: 302
>> Number of centroids: 31
>> Number of areas: 31
>> Number of isles: 3
>>> zm.fnl <- readVECT(zm.gnrl)
>>
>>
>> Error in scan(file, what, nmax, sep, dec, quote, skip, nlines,
>> na.strings, :
>> line 4 did not have 2 elements
>>> sessionInfo()
>> R version 3.2.2 (2015-08-14)
>> Platform: x86_64-w64-mingw32/x64 (64-bit)
>> Running under: Windows 7 x64 (build 7601) Service Pack 1
>>
>>
>>
>> locale:
>> [1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United
>> States.1252 LC_MONETARY=English_United States.1252
>> [4] LC_NUMERIC=C LC_TIME=English_United
>> States.1252
>>
>>
>>
>> attached base packages:
>> [1] stats graphics grDevices utils datasets methods base
>>
>>
>>
>> other attached packages:
>> [1] RPyGeo_0.9-3 RSAGA_0.94-3 plyr_1.8.3 gstat_1.0-26
>> shapefiles_0.7 foreign_0.8-65 maptools_0.8-37 rgdal_1.0-7
>> classInt_0.1-23
>> [10] raster_2.4-20 rgrass7_0.1-3 XML_3.98-1.3 sp_1.2-0
>>
>>
>>
>> loaded via a namespace (and not attached):
>> [1] Rcpp_0.12.1 intervals_0.15.1 lattice_0.20-33 FNN_1.1
>> spacetime_1.1-4 class_7.3-13 zoo_1.7-12 grid_3.2.2
>> [9] e1071_1.6-7 xts_0.9-7 tools_3.2.2
>>
>>
>>
>>
>> Thanks
>>
>>
>>
>>
>>
>>
>> 2015-10-08 18:57 GMT-03:00 Roger Bivand
>> <Roger.Bivand at nhh.no>:
>>
>>
>> Sorry this has taken a long time; please try installing the development
>> version available from:
>>
>>
>>
>> http://win-builder.r-project.org/8Y3Ihj451Clx
>>
>>
>>
>> (rgrass7_0.1-3.zip). The problem was the use of "_" instead of " " in the
>> name of the OGR shapefile driver - in OGR and R it is "ESRI Shapefile", in
>> GRASS it is "ESRI_Shapefile". Because the new long-name work-around worked
>> on systems not needing to use this
>> driver, it wasn't properly tested - and on Windows the GRASS standalone
>> has OGR with the SQLite driver, but the Windows rgdal binary does not have
>> SQLite. You may wish to install the R RSQLite package to move data if you
>> use long field/column names.
>>
>>
>>
>> Before installing this development version, and after library(rgrass7),
>> run example(readVECT) in the basic nc location from:
>>
>>
>>
>> https://grass.osgeo.org/sampledata/north_carolina/nc_basic_spm_grass7.zip
>>
>>
>>
>> it should fail. Then restart R, install the development version of rgrass7
>> from the first link, and repeat - it works for me and should resolve the
>> problem.
>>
>>
>>
>> Hope this helps,
>>
>>
>>
>> Roger
>>
>>
>>
>>
>>
>> --
>>
>> Roger Bivand
>>
>> Norwegian School of Economics
>>
>> Helleveien 30, 5045 Bergen, Norway
>>
>> Roger.Bivand at nhh.no
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> Fra:
>> grass-stats-bounces at lists.osgeo.org [grass-stats-bounces at lists.osgeo.org]
>> på vegne av Eduardo Diez [eduardodiez at gmx.com]
>>
>> Sendt: 24. september 2015 9:11
>>
>> Til:
>> grass-stats at lists.osgeo.org
>>
>> Emne: [GRASS-stats] rgrass7 read/write SpatialPolygonsDataFrames errors
>>
>>
>>
>>
>>
>>
>> Hi, I'm a user of R mostly for spatial information processing. Besides sp,
>> maptools, etc. i also use functions from GRASS, at first through spgrass6
>> and then rgrass7. A few days ago, I started having trouble reading and
>> writing SpatialPolygonsDataFrames using
>> readVECT and writeVECT. I tried both reinstalling both grass (6.4.4,
>> 7.0.0 and 7.0.1) and the R packages (spgrass6 0.8-6 and rgrass7 0.1-2), and
>> also with different R objects but i kept getting the same errors.
>>
>>
>>
>>
>>
>> The "mult.r" object is a RasterLayer with 4 zones and the objective is to
>> convert it to polygons and "clean" small areas with v.clean rmarea (as i
>> don't currently know a way of doing this in plain R).
>>
>>
>>
>>
>>
>>
>>
>> The first thing that came out strange was that when executing writeVECT it
>> would ask me for the driver to use (in the way of rgdal's writeOGR, it
>> didn't ask for it before). I figured out that object to be written should
>> be projected (not in lat-lon, don't know
>> why). After doing this i could write the vector and execute v.clean. The
>> problem came again when trying to read the cleaned polygons back to R.
>>
>> Below i paste an extract of my R console with the errors and some
>> information.
>>
>>
>>
>>
>>
>>
>>
>> Thanks in advance,
>>
>>
>>
>> Eduardo
>>
>>
>>
>>
>>
>>> mult.rp <- projectRaster(mult.r, crs = prj.crs, method = "ngb")
>>
>>> mult.pol <- rasterToPolygons(mult.rp, dissolve = T)
>>
>>
>>
>>> initGRASS(gisBase = "c:/Program Files (x86)/GRASS GIS 7.0.1", home =
>> tempdir(), override = T)
>>
>> gisdbase C:/Users/ediez1/AppData/Local/Temp/RtmpegbyiQ
>>
>> location file2f7c6dc070e6
>>
>> mapset file2f7c30eb3f52
>>
>> rows 1
>>
>> columns 1
>>
>> north 1
>>
>> south 0
>>
>> west 0
>>
>> east 1
>>
>> nsres 1
>>
>> ewres 1
>>
>> projection NA
>>
>>> writeVECT(mult.pol, "pol1", v.in.ogr_flags = "o")
>>
>> Error: !is.null(driver) is not TRUE
>>
>>> writeVECT(mult.pol, "pol1", v.in.ogr_flags = "o", driver = "ESRI
>> Shapefile")
>>
>>
>>
>> Over-riding projection check
>>
>> Check if OGR layer <r848659> contains polygons...
>>
>>
>>
>>
>>
>> Importing 4 features (OGR layer <r848659>)...
>>
>>
>>
>>
>>
>> -----------------------------------------------------
>>
>> Registering primitives...
>>
>> 3005 primitives registered
>>
>> 15587 vertices registered
>>
>> Number of nodes: 2691
>>
>> Number of primitives: 3005
>>
>> Number of points: 0
>>
>> Number of lines: 0
>>
>> Number of boundaries: 3005
>>
>> Number of centroids: 0
>>
>> Number of areas: -
>>
>> Number of isles: -
>>
>> -----------------------------------------------------
>>
>> Cleaning polygons
>>
>> -----------------------------------------------------
>>
>> Breaking polygons...
>>
>> Breaking polygons (pass 1: select break points)...
>>
>>
>>
>>
>>
>> Breaking polygons (pass 2: break at selected points)...
>>
>>
>>
>>
>>
>> -----------------------------------------------------
>>
>> Removing duplicates...
>>
>>
>>
>>
>>
>> -----------------------------------------------------
>>
>> Breaking boundaries...
>>
>>
>>
>>
>>
>> -----------------------------------------------------
>>
>> Removing duplicates...
>>
>>
>>
>>
>>
>> -----------------------------------------------------
>>
>> Cleaning boundaries at nodes...
>>
>>
>>
>>
>>
>> -----------------------------------------------------
>>
>> Merging boundaries...
>>
>>
>>
>>
>>
>> -----------------------------------------------------
>>
>> Removing dangles...
>>
>>
>>
>>
>>
>> -----------------------------------------------------
>>
>> Building areas...
>>
>>
>>
>>
>>
>> 95 areas built
>>
>> 8 isles built
>>
>> Number of nodes: 2771
>>
>> Number of primitives: 7307
>>
>> Number of points: 0
>>
>> Number of lines: 0
>>
>> Number of boundaries: 7307
>>
>> Number of centroids: 0
>>
>> Number of areas: 95
>>
>> Number of isles: 8
>>
>> -----------------------------------------------------
>>
>> Removing bridges...
>>
>>
>>
>>
>>
>> -----------------------------------------------------
>>
>> Registering primitives...
>>
>> 231 primitives registered
>>
>> 7594 vertices registered
>>
>> Building areas...
>>
>>
>>
>>
>>
>> 95 areas built
>>
>> 8 isles built
>>
>> Attaching islands...
>>
>>
>>
>>
>>
>> Number of nodes: 144
>>
>> Number of primitives: 231
>>
>> Number of points: 0
>>
>> Number of lines: 0
>>
>> Number of boundaries: 231
>>
>> Number of centroids: 0
>>
>> Number of areas: 95
>>
>> Number of isles: 8
>>
>> -----------------------------------------------------
>>
>> Finding centroids for OGR layer <r848659>...
>>
>>
>>
>>
>>
>> -----------------------------------------------------
>>
>> Writing centroids...
>>
>>
>>
>>
>>
>> -----------------------------------------------------
>>
>> 95 input polygons
>>
>> Total area: 1.28981E+006 (95 areas)
>>
>> -----------------------------------------------------
>>
>> Copying features...
>>
>>
>>
>>
>>
>> WARNING: Unable to delete file
>>
>>
>> 'C:/Users/ediez1/AppData/Local/Temp/Rtmpg10lvi/filec2473b0126/filec24129b63ac/.tmp/unknown/vector/tmp_10484/coor'
>>
>> Building topology for vector map <r848659 at filec24129b63ac>...
>>
>> Registering primitives...
>>
>> 326 primitives registered
>>
>> 7689 vertices registered
>>
>> Building areas...
>>
>>
>>
>>
>>
>> 95 areas built
>>
>> 8 isles built
>>
>> Attaching islands...
>>
>>
>>
>>
>>
>> Attaching centroids...
>>
>>
>>
>>
>>
>> Number of nodes: 144
>>
>> Number of primitives: 326
>>
>> Number of points: 0
>>
>> Number of lines: 0
>>
>> Number of boundaries: 231
>>
>> Number of centroids: 95
>>
>> Number of areas: 95
>>
>> Number of isles: 8
>>
>>
>>
>>
>>
>>> execGRASS("v.clean", flags = c("overwrite"), input = "pol1",
>>
>> + output = "clnpol", tool = "rmarea", threshold = 3000)
>>
>> --------------------------------------------------
>>
>> Tool: Threshold
>>
>> Remove small areas: 3000
>>
>> --------------------------------------------------
>>
>> Copying features...
>>
>>
>>
>>
>>
>> Rebuilding parts of topology...
>>
>> Building topology for vector map <k1f9f75 at filec24129b63ac>...
>>
>> Registering primitives...
>>
>> 326 primitives registered
>>
>> 7689 vertices registered
>>
>> Building areas...
>>
>>
>>
>>
>>
>> 95 areas built
>>
>> 8 isles built
>>
>> Attaching islands...
>>
>>
>>
>>
>>
>> Attaching centroids...
>>
>>
>>
>>
>>
>> Number of nodes: 144
>>
>> Number of primitives: 326
>>
>> Number of points: 0
>>
>> Number of lines: 0
>>
>> Number of boundaries: 231
>>
>> Number of centroids: 95
>>
>> Number of areas: 95
>>
>> Number of isles: 8
>>
>> --------------------------------------------------
>>
>> Tool: Remove small areas
>>
>>
>>
>>
>>
>> 55 areas of total size 29487.1 removed
>>
>> --------------------------------------------------
>>
>> Rebuilding topology for output vector map...
>>
>> Building topology for vector map <k1f9f75 at filec24129b63ac>...
>>
>> Registering primitives...
>>
>> 212 primitives registered
>>
>> 6840 vertices registered
>>
>> Building areas...
>>
>>
>>
>>
>>
>> 40 areas built
>>
>> 4 isles built
>>
>> Attaching islands...
>>
>>
>>
>>
>>
>> Attaching centroids...
>>
>>
>>
>>
>>
>> Number of nodes: 136
>>
>> Number of primitives: 212
>>
>> Number of points: 0
>>
>> Number of lines: 0
>>
>> Number of boundaries: 172
>>
>> Number of centroids: 40
>>
>> Number of areas: 40
>>
>> Number of isles: 4
>>
>>> cln.pol <- readVECT("clnpol")
>>
>> Error: !is.null(driver) is not TRUE
>>
>>> cln.pol <- readVECT("clnpol", driver = "ESRI Shapefile")
>>
>> Error in scan(file, what, nmax, sep, dec, quote, skip, nlines,
>> na.strings, :
>>
>> line 4 did not have 2 elements
>>
>>
>>
>>
>>
>>> sessionInfo()
>>
>> R version 3.2.2 (2015-08-14)
>>
>> Platform: x86_64-w64-mingw32/x64 (64-bit)
>>
>> Running under: Windows 7 x64 (build 7601) Service Pack 1
>>
>>
>>
>>
>>
>> locale:
>>
>> [1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United
>> States.1252 LC_MONETARY=English_United States.1252
>>
>> [4] LC_NUMERIC=C LC_TIME=English_United
>> States.1252
>>
>>
>>
>>
>>
>> attached base packages:
>>
>> [1] stats graphics grDevices utils datasets methods base
>>
>>
>>
>>
>>
>> other attached packages:
>>
>> [1] rgrass7_0.1-2 classInt_0.1-22 maptools_0.8-36 ggplot2_1.0.1
>> XML_3.98-1.3 raster_2.4-20 sp_1.2-0
>>
>>
>>
>>
>>
>> loaded via a namespace (and not attached):
>>
>> [1] Rcpp_0.12.1 magrittr_1.5 MASS_7.3-43 munsell_0.4.2
>> colorspace_1.2-6 lattice_0.20-33 stringr_1.0.0 plyr_1.8.3
>>
>> [9] tools_3.2.2 parallel_3.2.2 rgdal_1.0-7 grid_3.2.2
>> gtable_0.1.2 e1071_1.6-7 class_7.3-13 rgeos_0.3-12
>>
>> [17] digest_0.6.8 reshape2_1.4.1 labeling_0.3 stringi_0.5-5
>> scales_0.3.0 foreign_0.8-65 proto_0.3-10
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>> grass-stats mailing list
>> grass-stats at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/grass-stats
>>
>
--
Roger Bivand
Department of Economics, Norwegian School of Economics,
Helleveien 30, N-5045 Bergen, Norway.
voice: +47 55 95 93 55; fax +47 55 95 91 00
e-mail: Roger.Bivand at nhh.no
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