[R] distance matrix

[Erin Hodgess]

Suppose you have:

> x <- runif(25)
> y <- rnorm(25)
> x.df <- data.frame(x,y)
> dist(x.df)


The default is euclidean distance.

Hope this helps!

Sincerely,
Erin


On Jan 20, 2008 2:41 PM, WCD <vydramail at quick.cz> wrote:
>
> Hello, I want do get the point to point distance matrix.
> Suppose, I have a data frame where the first column is X and second column
> is Y coordinate of points.
> I define a function dst(x1,y1,x2,y2) to claculate distance between two
> points. But I don't know how to tell R to calculate dst for every two points
> and create a matrix of these distances.
>
> Can you give me a little guidance, please? I am quite new to R and
> programming.
> Thanks for every advice. Filip Kral.
>
> --
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-- 
Erin Hodgess
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
mailto: erinm.hodgess at gmail.com