Displaying 3 results from an estimated 3 matches for "mahalonobi".
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mahalonobis
2008 Oct 09
2
vectorization instead of using loop
...want to calculate Euclidian distances. We want to
calculate Mahalanobis distances, which take into account the covariance
among variables.
Below is the piece of code we wrote ("covmat" in the function below is the
variance-covariance matrix among variables in Data that has to be fed into
mahalonobis function we are using).
mahadist = function(x, covmat) {
dismat = matrix(0,ncol=nrow(x),nrow=nrow(x))
for (i in 1:nrow(x)) {
dismat[i,] = mahalanobis(as.matrix(x), as.matrix(x[i,]), covmat)^.5
}
return(dismat)
}
This piece of code works, but it is very slow. We were wondering if it...
2003 Aug 11
2
cluster analysis
I'like to do cluster analysis by using mahalanobis distance.
Could you tell me how to do?
2008 Oct 07
1
vectorization of a loop for mahalanobis distance calculation
...want to calculate Euclidian distances. We want to calculate
Mahalanobis distances, which take into account the covariance among
variables.
Below is the piece of code we wrote ("covmat" in the function below is the
variance-covariance matrix among variables in Data that has to be fed into
mahalonobis function we are using).
mahadist = function(x, covmat) {
dismat = matrix(0,ncol=nrow(x),nrow=nrow(x))
for (i in 1:nrow(x)) {
dismat[i,] = mahalanobis(as.matrix(x), as.matrix(x[i,]), covmat)^.5
}
return(dismat)
}
This piece of code works, but it is very slow. We were wondering if...