R help - Apr 2013 - Cannot scale data

Hello!

I have this error in R:

In svm.default(x, y, scale = scale, ..., na.action = na.action) :
  Variable(s) ‘X.11.’ constant. Cannot scale data.

Of course, I have a column of 25 rows where the values are always 0. Why it
is not possible to have a column with 0?
I need this column because is a feature from a patient. Is there any way to
solve this error?

Thanks in advance!

	[[alternative HTML version deleted]]

Hello,

Can't you simply call svm() with scale = FALSE ?
If the variable is constant, it cannot be scaled to unit variance (and 
zero mean).

Hope this helps,

Rui Barradas

Em 06-04-2013 17:19, Nicol?s S?nchez escreveu:
> Hello!
>
> I have this error in R:
>
> In svm.default(x, y, scale = scale, ..., na.action = na.action) :
>    Variable(s) ?X.11.? constant. Cannot scale data.
>
> Of course, I have a column of 25 rows where the values are always 0. Why it
> is not possible to have a column with 0?
> I need this column because is a feature from a patient. Is there any way to
> solve this error?
>
> Thanks in advance!
>
> 	[[alternative HTML version deleted]]
>
>
>
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