Dear Sarah, many thanks for the hint.
Unfortunately my distance metric is more complex. For me it is not only important to know whether there is a change between rows but also to know where (which column) the change occurs and furthermore to know if there is a change in e.g. column 5 to look at column 144 etc. in order to be able to calculate a kind of weighted distance matrix. I doubt that it would be possible to decompose my metric into some of the common manipulations(?) Albeit I had a look at the package ecodist (many thanks for that, now I can solve an other problem ;) ). Based on this mechanism of decomposing I will adopt this idea to prepare some subfunctions written in C which could be combined to solve a specific problem. Doing so other users can modify these a bit easier (I hope). But nevertheless I still have a speed problem! Best regards, Hans ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
