Hi,
Thank you .. The information was very helpful.
Yes.It was meant to be centers=3.Even with that , kmeans gives error if we
give the index of Species columns.
So, *is it ok to use kmeans for String data by using cbind*.But,
kmeans*works even if we give a column which contains distinct String
values
*.
For example,a column which contains names like country names.How does this
work in such cases? Is it expected behavior?
Country
-----------
England
Germany
China
Thanks,
Raji
On Mon, Oct 17, 2011 at 1:02 AM, Christoph Molnar <
christoph.mol...@googlemail.com> wrote:
> Hi,
>
> I suspect your column Species is of class "factor" (as it is in R's built
> in iris dataset).
> This means that in your case Species is an integer vector with the
> additional information of the levels names. kmeans is internally calling
> as.matrix(), which creates a character matrix of your dataframe, because one
> column is factor and you get an error.
>
> After binding the columns with cbind, the result is an integer matrix with
> the Species columns as the internal levels (1,2 and 3 instead of "setosa"
> "versicolor" "virginica" ) and kmeans is not throwing a error any more.
>
> Furthermore kmeans wouldn't work in the first case, because there is no
> "size=" - argument in kmeans. You probably meant centers=3.
> For additional information try ?kmeans
>
> Christoph
>
>
> 2011/10/16 Raji <raji.sanka...@gmail.com>
>
>> Hi All,
>>
>> For executing kmeans for Iris, we found that there were 2 different ways.
>>
>> dataFrame <- read.csv("c:/Iris.csv",header=T)
>>
>> 1. kmeans_model<-kmeans(dataFrame[1:5],size=3)
>> *This gave an error as it had Species which is a String column as one of
>> the inputs*
>>
>> 2.attach(dataFrame)
>>
>>
>> kmeans_model<-kmeans(cbind(SepalLength,SepalWidth,PetalLength,PetalWidth,Species),3)
>>
>> * But this command worked and gave output.*
>>
>> Does this mean that kmeans can accept String inputs also?
>>
>> Can you please let me know how the second command works?
>>
>> Thanks in advance.
>>
>> Regards,
>> Raji
>>
>> --
>> View this message in context:
>> http://r.789695.n4.nabble.com/Help-in-kmeans-tp3430433p3909552.html
>>
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> ______________________________________________
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>>
>
>
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