[R] Distance between a vector and matrix rows

[Dennis Murphy]

Hi:

> sqrt(0.2)
[1] 0.4472136

Evidently, distancevector() is finding the *average* distance between
the two vectors.

HTH,
Dennis

On Mon, Aug 8, 2011 at 12:02 AM, vioravis <vioravis at gmail.com> wrote:
> I am trying to find the distance between a vector and each row of a
> dataframe. I am using the function "distancevector" in the package "hopach"
> as follows:
>
> mydata<-as.data.frame(matrix(c(1,1,1,1,0,1,1,1,1,0),nrow=2))
>
>  V1 V2 V3 V4 V5
> 1  1  1  0  1  1
> 2  1  1  1  1  0
> vec <- c(1,1,1,1,1)
> d2<-distancevector(mydata,vec,d="euclid")
>
> The Euclidean distance between the two rows of the data frame to the vector
> should be 1. But I am getting 0.4472136 for both.
>
> Can someone please point out the reason for the discrepancy???
>
> Also, are there other packages for calculating the distance between a binary
> vector and all the rows of a data frame (contains only binary values)?
>
> Thank you.
>
> Ravi
>
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