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en:similarity_examples [2020/03/24 15:34]
Lin, Po-Yu
en:similarity_examples [2020/03/24 15:58] (current)
Lin, Po-Yu
Line 34: Line 34:
 which (as.matrix (vltava.bray) == min (vltava.bray),​ arr.ind = TRUE) which (as.matrix (vltava.bray) == min (vltava.bray),​ arr.ind = TRUE)
 </​code>​ </​code>​
-The function ''​which''​ will return the position of TRUE value in the argument – here, after setting argument ''​arr.ind = TRUE''​ (return array index) it will return the row and column of the shorted ​Bray-Curtis distance. Note that the function ''​min''​ needs to be applied on the original ''​vltava.bray''​ object, which is of the class ''​dist''​ – in fact, this is a vector, which is wrapped into the triangular “distance matrix”. This triangle does not contain the diagonal values, which are all zeros here (we are calculating distances) – otherwise, the ''​min''​ function would always return zero.+The function ''​which''​ will return the position of TRUE value in the argument – here, after setting argument ''​arr.ind = TRUE''​ (return array index) it will return the row and column of the shortest ​Bray-Curtis distance. Note that the function ''​min''​ needs to be applied on the original ''​vltava.bray''​ object, which is of the class ''​dist''​ – in fact, this is a vector, which is wrapped into the triangular “distance matrix”. This triangle does not contain the diagonal values, which are all zeros here (we are calculating distances) – otherwise, the ''​min''​ function would always return zero.
 Plots 2 and 4 are the most similar – no wonder, since if we print and compare their species composition,​ most of the species occur in both of them: Plots 2 and 4 are the most similar – no wonder, since if we print and compare their species composition,​ most of the species occur in both of them:
 <code rsplus> <code rsplus>
en/similarity_examples.txt · Last modified: 2020/03/24 15:58 by Lin, Po-Yu