Error while using as.factor function

[Milica Rankovic]

Dear colleagues, 

I tried to classify variable from my raster stack of predictor variables as a factor via function:

predictors[,'var1'] = as.factor(predictors[,'var1']) 

but R showed me this kind of mistake:

Error in h(simpleError(msg, call)) : error in evaluating the argument 'x' in selecting a method for function 'as.factor': object of type 'S4' is not subsettable

 Did someone else have a similar problem and how did you solve it?

Thank you and best regards,

Milica

[Bede-Fazekas Ákos]

Dear Milica,
RasterStack is not subsettable with the [i, j] operator but with [[i]] operator. So try this:
predictors[['var1']] = as.factor(predictors[['var1']])
HTH,
Ákos Bede-Fazekas

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[Milica Rankovic]

Dear Akos, 

thank you very much for helping, I will try it,

Best regards,

Milica

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MSc Milica Ranković, PhD student

Research Assistant 
University of Novi Sad
Faculty of Sciences
Department of Biology and Ecology
Trg Dositeja Obradovica 2
21000 Novi Sad
Serbia