I get slightly different error when using scale to nonnumeric data so I am not sure if you use the scale function from base package.
Error in colMeans(x, na.rm = TRUE) : 'x' must be numeric
Anyway, how do you expect scaling shall be done when you have nonumeric variable. What shall be the output of
The only workaround is either to scale only numeric variables from your data and add nonnumeric in folowing step or to change all factor variable to numeric before scaling (which I would not recommend).
If your data are supposed to be numeric you can check if they really are by
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of ch.elahe
Sent: Tuesday, June 14, 2016 5:29 PM
To: R-help Mailing List <email@example.com
Subject: [R] Factor levels in training set
I want to use Supervised Self organizing Maps from Kohonen package for my
data. I need to divide my df into training set and test set, but a part of my df
contains column with factor levels and I don't know how to bring them into
my training set. Currently I use the following command for my training set:
till here I get no error but in the next step which I need to bring my training
set in a matrix I face this error:
error: 'x' should be numeric
Does anyone know how should I include column with factor levels in my df so
that I don't get this error?
Thanks for any help,
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