[GRASS-user] v.class.mlR error

[James Duffy]

On 11 November 2016 at 10:07, Moritz Lennert <mlennert at club.worldonline.be>
wrote:

>
>
> Le 11 novembre 2016 10:21:11 GMT+01:00, James Duffy <
> james.philip.duffy at gmail.com> a écrit :
> >On 10 November 2016 at 19:37, Moritz Lennert
> ><mlennert at club.worldonline.be>
> >wrote:
> >
> >>
> >>
> >> Le 10 novembre 2016 15:45:59 GMT+01:00, James Duffy <
> >> james.philip.duffy at gmail.com> a écrit :
> >> >Hello,
> >> >
> >> >I'm trying to run v.class.mlR on a vector map, with a separate
> >vector
> >> >map
> >> >containing my training data. Currently I have two classes '1' and
> >'2'
> >> >stored in the column 'class'. My region is set to that of the
> >segments
> >> >to
> >> >be classified. I run the following command:
> >> >
> >> >v.class.mlR segments_map=gp_seg_stats_vec at gp1 \
> >> >training_map=gp_seg_sed_grass at gp1 train_class_column=class \
> >> >output_class_column=vote output_prob_column=prob folds=5 \
> >> >partitions=10 tunelength=10 weighting_metric=accuracy
> >> >
> >> >And get the following output:
> >> >
> >> >Running R now. Following output is R output.
> >> >Loading required package: caret
> >> >Loading required package: lattice
> >> >Loading required package: ggplot2
> >> >Loading required package: kernlab
> >> >
> >> >Attaching package: ‘kernlab’
> >> >
> >> >The following object is masked from ‘package:ggplot2’:
> >> >
> >> >    alpha
> >> >
> >> >Loading required package: randomForest
> >> >randomForest 4.6-12
> >> >Type rfNews() to see new features/changes/bug fixes.
> >> >
> >> >Attaching package: ‘randomForest’
> >> >
> >> >The following object is masked from ‘package:ggplot2’:
> >> >
> >> >    margin
> >> >
> >> >Loading required package: rpart
> >> >Error in eval(expr, envir, enclos) : object 'cat_' not found
> >> >Calls: data.frame ... predict.train -> model.frame ->
> >> >model.frame.default
> >> >-> eval -> eval
> >> >Execution halted
> >> >ERROR: There was an error in the execution of the R script.
> >> >       Please check the R output.
> >> >
> >> >
> >> >I'm not entirely sure where it's looking for anything called 'cat_'.
> >> >
> >> >Any help much appreciated please.
> >>
> >>
> >> Could you send us the output of v.info -c for both of the input maps
> >?
> >>
> >
> >v.info -c --verbose map=gp_seg_stats_vec at gp1
> >
> >INTEGER|cat
> >DOUBLE PRECISION|area
> >DOUBLE PRECISION|perimeter
> >DOUBLE PRECISION|fd
> >DOUBLE PRECISION|gpo1min
> >DOUBLE PRECISION|com_circ
> >DOUBLE PRECISION|gpo1max
> >DOUBLE PRECISION|gpo1range
> >DOUBLE PRECISION|gpo1mean
> >DOUBLE PRECISION|gpo1stdev
> >DOUBLE PRECISION|gpo1var
> >DOUBLE PRECISION|gpo1sum
> >DOUBLE PRECISION|gpo2min
> >DOUBLE PRECISION|gpo2max
> >DOUBLE PRECISION|gpo2range
> >DOUBLE PRECISION|gpo2mean
> >DOUBLE PRECISION|gpo2stdev
> >DOUBLE PRECISION|gpo2var
> >DOUBLE PRECISION|gpo3min
> >DOUBLE PRECISION|gpo3max
> >DOUBLE PRECISION|gpo3range
> >DOUBLE PRECISION|gpo3mean
> >DOUBLE PRECISION|gpo3stdev
> >DOUBLE PRECISION|gpo3var
> >DOUBLE PRECISION|gpo3sum
> >DOUBLE PRECISION|gpo4min
> >DOUBLE PRECISION|gpo4max
> >DOUBLE PRECISION|gpo4range
> >DOUBLE PRECISION|gpo4mean
> >DOUBLE PRECISION|gpo4stdev
> >DOUBLE PRECISION|gpo4var
> >DOUBLE PRECISION|gpo4sum
> >Displaying column types/names for database connection of layer <1>:
> >(Fri Nov 11 09:17:34 2016) Command finished (0 sec)
> >
> >v.info -c --verbose map=gp_seg_sed_grass at gp1
> >
> >INTEGER|cat
> >INTEGER|cat_
>
> This is the problem. cat_ using the training data, but not in the segments
> file. Erasing this column from the training data should be enough to solve
> the problem.
>

Ok, i'm pretty sure that the script made that as the shapefile i've read
into GRASS didn't have 'cat_' has a column in the attribute table.

I have deleted it, and now get the following when trying to run the
v.class.mlR code I posted above:

Loading required package: rpart
Error in model.frame.default(Terms, newdata, na.action = na.action, xlev =
object$xlevels) :
  invalid type (closure) for variable 'type'
Calls: data.frame ... predict.train -> model.frame -> model.frame.default
Execution halted
ERROR: There was an error in the execution of the R script.
       Please check the R output.


'type' is a character column which just has one word descriptions of my
cover types in it. Does the code not deal well with non-numeric attributes?

James




>
> Moritz
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