search for: uddin

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2007 Apr 08
1
How do I back transforme ordinary log-krigged prdiction values?
I have a question to everybody. After log10 transfprmation, I have done ordinary kriging in gstat in R? I need to back trnasform the prediction values to orgiginal scale. How do I do this in gstat in R? Thanks Zia -- Zia Uddin Ahmed 915 Brad Field Hall Department of Crop and Soil Cornell University Ithaca NY 14850 USA
2007 Apr 04
5
how to image.plot a XY grid file into a lat-lon map
Hi All, I have a netcdf gridded file with LCC projection. I can easily use image.plot to visualize it. However, as the axises are in X,Y, not Lat and Lon, I could not add state or country maps onto it (or lat lon information). I do have a grid2d file that describes the lat and lon for each (X,Y) grid, but the lat and lon are not regularly spaced, so I could not use image.plot. Does anyone know
2012 Jan 03
0
Biglm source code alternatives (E.g. Call to Fortran)
Hi everyone, I have been looking at the Bigglm (Basically does Generalised Linear Models for big data under the Biglm package) command and I have done some profiling on this code and found that to do a GLM on a 100mb file (9 million rows by 5 columns matrix(most of the numbers were either a 0,1 or 2 randomly generated)) it took about 2 minutes on a linux machine with 8gb of RAM and 4 cores.
2011 Dec 14
0
Reading Oracle SQL Developer BLOB/CLOB files into R (Packages: DBI, foreign, RODBC, ROracle)
Hi everyone, I have been following these forums closely for the last few months but this is my first time posting. Basically I am trying to get an Oracle SQL Developer Binary Large Object(BLOB/CLOB) file in as an R object in R. For those not familiar with a BLOB/CLOB file, it is basically lik a table that has cells that contain tables or files. By converting the large table into a BLOB/CLOB file