I think this does it (but please check; I quickly stuck together two different pieces of code)...

# matrix where each vector is a row vec.mat <- ... #Compute group*loci matrix of mean microsatellite lengths angle.mat <- matrix(NA,nrow=nrow(vec.mat),ncol=nrow(vec.mat)) # angle function (radians converted to degrees) vec.angle <- function(v1,v2){cos(t(v1)%*%v2)*57.2958} # angles-to-matrix loop for(i in 1:nrow(vec.mat)) { for(j in 1:nrow(vec.mat)) { # angle bw vec1 and vec2 angle.mat[i, j] <- vec.angle(vec.mat[i,], vec.mat[j,])} } return(angle.mat) } On Fri, Nov 3, 2017 at 2:38 AM, andrea cardini <alcard...@gmail.com> wrote: > Dear All, > please, does anyone know if there's an R package that, using a matrix with > several vectors (e.g., coefficients for allometric regressions in different > taxa), will compute the pairwise (all possible pairs of taxa) matrix of > vector angles? > > Thanks in advance for any suggestion. > Cheers > > Andrea > > > -- > > Dr. Andrea Cardini > Researcher, Dipartimento di Scienze Chimiche e Geologiche, Università di > Modena e Reggio Emilia, Via Campi, 103 - 41125 Modena - Italy > <https://maps.google.com/?q=Emilia,+Via+Campi,+103+-+41125+Modena+-+Italy&entry=gmail&source=g> > tel. 0039 059 2058472 > > Adjunct Associate Professor, School of Anatomy, Physiology and Human > Biology, The University of Western Australia, 35 Stirling Highway, Crawley > WA 6009, Australia > > E-mail address: alcard...@gmail.com, andrea.card...@unimore.it > WEBPAGE: https://sites.google.com/site/alcardini/home/main > > FREE Yellow BOOK on Geometric Morphometrics: > http://www.italian-journal-of-mammalogy.it/public/journals/3 > /issue_241_complete_100.pdf > > ESTIMATE YOUR GLOBAL FOOTPRINT: http://www.footprintnetwork.or > g/en/index.php/GFN/page/calculators/ > > -- > MORPHMET may be accessed via its webpage at http://www.morphometrics.org > --- You received this message because you are subscribed to the Google > Groups "MORPHMET" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to morphmet+unsubscr...@morphometrics.org. > > -- David C. Katz, Ph.D. Postdoctoral Fellow Benedikt Hallgrimsson Lab University of Calgary Research Associate Department of Anthropology University of California, Davis ResearchGate profile <https://www.researchgate.net/profile/David_Katz29> Personal webpage <https://davidckatz.wordpress.com/> -- MORPHMET may be accessed via its webpage at http://www.morphometrics.org --- You received this message because you are subscribed to the Google Groups "MORPHMET" group. To unsubscribe from this group and stop receiving emails from it, send an email to morphmet+unsubscr...@morphometrics.org.