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9 results for “from:Philip Leifeld”

incidence and adjacency matrix conversion
Philip Leifeld · Dec 5, 2006 · r-help

Dear all, how can I convert an m x n incidence matrix into an m x m adjacency matrix or an n x n adjacency matrix? The current matrix contains binary data, hence the new matrix would contain counts of...

parsing Google search results
Philip Leifeld · Nov 16, 2009 · r-help

Hi, how can I parse Google search results? The following code returns "integer(0)" instead of "1" although the results of the query clearly contain the regex "cran". #### address <- url("http://www.google.com/search?q=cran") open(address) lines...

incidence and adjacency matrix conversion
Philip Leifeld · Dec 7, 2006 · r-help

Thanks, David. I tried converting my rectangular matrix to a network object and then back to a square matrix. This works for a small artificial dataset (e.g. 2x5), but when I try this on my 1790x45 or transposed 45x1790...

incidence and adjacency matrix conversion
Philip Leifeld · Dec 7, 2006 · r-help

Thanks, David. I tried converting my rectangular matrix to a network object and then back to a square matrix. This works for a small artificial dataset (e.g. 2x5), but when I try this on my 1790x45 or transposed 45x1790...

isoMDS vs. other non-metric non-R routines
Philip Leifeld · Feb 13, 2007 · r-help

Dear useRs, last week I asked you about a problem related to isoMDS. It turned out that in my case isoMDS was trapped. Nonetheless, I still have some problems with other data sets. Therefore I would like to know if...

isoMDS - high stress value and strange configuration
Philip Leifeld · Feb 7, 2007 · r-help

Dear R users, I have a specific question about isoMDS. Imagine the following (fake) distance table: hamburg bremen berlin munich cologne hamburg 0 911 982 677 424 bremen 911 0 293 547 513 berlin 982 293 0 785 875 munich...

isoMDS vs. other non-metric non-R routines
Philip Leifeld · Feb 13, 2007 · r-help

Thanks for your message. > I don't know what is Minissa. Sounds like a piece of software. What > is the method it implements? That is, is it supposed to implement > the same method as isoMDS or something else? IsoMDS implements...

Exporting a method to a cluster object
Philip Leifeld · Nov 17, 2015 · r-devel

Hi, This is my first message to this list. It would be great if people here could help me with the following problem (self-contained code example below): I have a list of matrices and would like to apply a...

Questions about interpreting ERGM goodness of fit
Philip Leifeld · Jul 27, 2016 · r-sig-networks

Hi Erick, This indicates a lack of theoretical understanding of what is creating your network topology. Most likely, the interplay of endogenous network statistics you have chosen collectively produces networks that do not look like the network you observe. It...

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