Step-Across Distance
Solves for the shortest-path step-across distance for a given distance matrix
stepdist(dis,alpha)
dis |
a distance or dissimilarity object of class ‘dist’ |
alpha |
a threshold distance to establish the step-across |
The function takes the dist object and converts all values >= alpha to 9999.9 and then solves for new distances by calculating the transitive closure of the triangle inequality.
an object of class ‘dist’
The ‘dsvdis’ function includes a step-across function in the initial calculation of a distance or dissimilarity matrix. This function simply allows the conversion to take place at a later time, or on distance metrics that ‘dsvdis’ doesn't support.
data(bryceveg) dis.bc <- dsvdis(bryceveg,'bray') dis.bcx <- stepdist(dis.bc,1.00) disana(dis.bcx)
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