Re: [GRASS-stats] Re: [GRASS-user] Testing i.pca ~ prcomp(), m.eigensystem ~ princomp()

Edzer Pebesma wrote: Markus, a few notes: - if you do PCA on uncentered data, by computing the eigenvalues of the uncentered covariance matrix, this implies that bands with a larger mean will get more influence on the final PCAs. I have sofar not managed finding an argument why this would be

[GRASS-stats] new module for multiple regression with large raster maps

There is a new module r.regression.multi as grass7 add-on to calculate multiple regressions with raster maps. The motivation for this module is to calculate regression coefficients and statistics for very large datasets, too large for e.g. R. The module uses less than 3 MB memory for 400 million

Re: [GRASS-stats] Re: Problem with v.distance in spgrass6 package in R

2011/11/3 Roger Bivand roger.biv...@nhh.no: On Wed, 2 Nov 2011, toke wrote: Hi Roger and everybody else I finally found time to translate the problem into spearfish data. To recapitulate I would like to use the v.distance command to transfer information from polygons to point data. The

[GRASS-stats] i.pca fixes in trunk

Hi all, based on the wiki for Principal Components Analysis [0], numerous discussions in the mailing lists [1,2,3,4], particularly a comment by Edzer Pebesma [5], and personal demand, I have fixed a few issues in i.pca in trunk r49090. - the faulty or missing centering of the input bands

Re: [GRASS-stats] new module for multiple regression with large raster maps

Dylan Beaudette wrote: On Friday, October 07, 2011, Markus Metz wrote: There is a new module r.regression.multi as grass7 add-on to calculate multiple regressions with raster maps. The motivation for this module is to calculate regression coefficients and statistics for very large datasets

Re: [GRASS-stats] readVECT6 - ogr fails to export some columns

On Fri, Apr 20, 2012 at 4:47 PM, Eric Momsen eric.mom...@ndsu.edu wrote: Hi, I've been using GRASS and R for a few months now, and just ran into a snag.  We added some new attribute columns to our vector file in GRASS, and now when I try to move the data into R the transfer fails. The

Re: [GRASS-stats] rgrass7 - SQLite and GML drivers not working for readVECT

Dear Roger, On Wed, Oct 11, 2017 at 1:41 PM, Roger Bivand wrote: > > New version submitted to CRAN; until then: > > install.packages("rgrass7", repos="http://R-Forge.R-project.org;) > > should pick up the latest version; #3425 closed. Please report back whether this works

Re: [GRASS-stats] rgrass7 - SQLite and GML drivers not working for readVECT

; writeVECT(bbox, "bbox_from_R", driver = "SQLite") > Error: driver %in% candDrivers is not TRUE > > > writeVECT(bbox, "bbox_from_R", driver = "ESRI Shapefile") > ... all goes fine... > > Sorry for bothersome and thanks much in advance! > > b