Thank you! I managed it with this function - for a data fram with x and y
coordinates:
anglefun<-function(x,y,unit="degrees") {x.new<-outer(x,x,"-");
y.new<-outer(y,y,"-");angles<-atan2(x.new,y.new);diag(angles)<-NA;if(unit
== "degrees")
return(180*angles/pi)
if (unit == "radians")
return(angles
Le samedi 28 mars 2009 à 16:06 +, Wanja Mathar a écrit :
> Hi everyone,
>
> i have a matrix of points and want to calculate the direction and length of
> each vector between the points.
>
> I can easily calculate the length with dist(testdata), but is their a
> function that returns a matri
Hi everyone,
i have a matrix of points and want to calculate the direction and length of
each vector between the points.
I can easily calculate the length with dist(testdata), but is their a function
that returns a matrix of the direction of the vectors between points (angles
0-360°)?
testda
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