Anusheema: The first error is because you didn't specify an out filename (it needs to be a character).
Re: the second error -- is there a predict.R_Weka_classifier_interface (or something along those lines) in that package? For predict to work, you need a predict.* statement available. You might want to swap in a randomForest for the classifier you are using, at least to begin with -- randomForest does work properly with raster's predict() statement. --j On Tue, May 6, 2014 at 1:37 AM, Anusheema Chakraborty <anushe...@gmail.com> wrote: > Hi! > > I am trying to classify satellite image in R using RWeka classifier, > J48. I have a CSV file with the classes required, and raster data > loaded in R. I am able to make the tree, however, I am not able to use > the same tree to classify my satellite image. > > Here's how it goes. > > inputfile=read.csv("E://R/Trial/naini.CSV") > m1 <- J48(Class~B1+B2+B3+B4+B5+B7, data = inputfile) > if(require("party", quietly = TRUE)) plot(m1) > raster<- brick("merge.tif") > plotRGB(raster, 4, 3, 2, stretch="hist") > > And then I am attempting to use the tree generated to classify my > satellite image, but I keep getting errors. > > predict (test_new, J48, filename=out_classify, > progress='text',format='GTiff', datatype='FLT4S', type='response', > overwrite=TRUE) > Error in trim(filename) : error in evaluating the argument 'x' in > selecting a method for function 'trim': Error: object 'out_classify' > not found > > And if I change the arguments, this is what I get. I am not sure how > to proceed from this point forward. > > predict (J48, test_new, filename=out_classify, > progress='text',format='GTiff', datatype='FLT4S', type='response', > overwrite=TRUE) > Error in UseMethod("predict") : no applicable method for 'predict' > applied to an object of class "c('R_Weka_classifier_interface', > 'R_Weka_interface')" > > I am new to R, so I might take a while to decipher your answers. Any > help would be greatly appreciated! > > Thanks! > > > Best, > Anusheema. > > > > -- > Regards > > Anusheema Chakraborty > Ph.D. Scholar > Department of Natural Resources, TERI University > 10, Institutional Area, Vasant Kunj, New Delhi - 110070 > Website: www.teriuniversity.ac.in > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-geo -- Jonathan A. Greenberg, PhD Assistant Professor Global Environmental Analysis and Remote Sensing (GEARS) Laboratory Department of Geography and Geographic Information Science University of Illinois at Urbana-Champaign 259 Computing Applications Building, MC-150 605 East Springfield Avenue Champaign, IL 61820-6371 Phone: 217-300-1924 http://www.geog.illinois.edu/~jgrn/ AIM: jgrn307, MSN: jgrn...@hotmail.com, Gchat: jgrn307, Skype: jgrn3007 _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo