OK this does work: I can subtract eg the titles. But how can I say R that it should make a link between title, keyword and frequency of the keywords in order to have a 3 d plot?
Thanks a lot for helping me until here anyway! Cheers On Mon, 2009-12-14 at 16:15 +0100, Romain Francois wrote: > Hello, > > Sorry to arrive late on this. Did you try the recently uploaded "bibtex" > package. It reads a bibtex file into an R list (of class citationList). > > So for example : if your posted example lives in biblio.bib for example, > you can read it like this : > > > bib <- read.bib( "biblio.bib" ) > > sapply( bib[[1]], function(item) item$title ) > [1] "Adsorption and Diffusion of VO<sup>2+</sup> and\nVO<sub>2</sub> > <sup>+</sup>\n\tacross Cation Membrane for All-Vanadium Redox Flow Battery" > [2] "Modification of Daramic, microporous separator, for redox\nflow > battery\n\tapplications" > > Romain > > On 12/11/2009 03:41 PM, Schwan wrote: > > > > They are in Bibtex > > > > For example: > > > > "@ARTICLE{adsdifvanadiumcationexchange, > > author = {Jin-qing Chen and Bao-guo Wang and Ji-chu Yang}, > > title = {Adsorption and Diffusion of VO<sup>2+</sup> and > > VO<sub>2</sub> <sup>+</sup> > > across Cation Membrane for All-Vanadium Redox Flow Battery}, > > journal = {Solvent Extraction and Ion Exchange}, > > year = {2009}, > > volume = {27}, > > pages = {312--327}, > > number = {2}, > > abstract = {A method based on a selectivity coefficient and the > > Nernst-Planck > > equation is proposed to determine diffusion coefficients of vanadium > > ions across a cation exchange membrane in VO<sup>2+</sup>/H<sup>+</sup> > > and VO<sub>2</sub> <sup>+</sup>/H<sup>+</sup> systems. This simplified > > method can be applied to high concentrations of vanadium ions. Three > > cation exchange membranes were studied. The logarithmic value of > > the selectivity coefficient was linearly dependent on the molar > > fraction > > of vanadium ions in solution. The diffusion coefficient of vanadium > > ions decreased with decreasing water content. The membrane with the > > lowest diffusion coefficient was selected as a battery separator > > and showed the lowest capacity loss of the studied membranes.}, > > issn = {0736-6299}, > > publisher = {Taylor \& Francis}, > > url = {http://www.informaworld.com/10.1080/07366290802674614} > > } > > > > @ARTICLE{Chieng1992, > > author = {Chieng, S.C. and Kazacos, M. and Skyllas-Kazacos, M.}, > > title = {Modification of Daramic, microporous separator, for redox > > flow battery > > applications}, > > journal = {Journal of Membrane Science}, > > year = {1992}, > > volume = {75}, > > pages = {81--91}, > > number = {1-2}, > > month = dec, > > issn = {0376-7388}, > > keywords = {Daramic, microporous separator, redox flow cell and > > battery}, > > owner = {schwan}, > > timestamp = {2009.11.30}, > > url = > > {http://www.sciencedirect.com/science/article/B6TGK-43S71CR-7K/2/06f90d391c0eff0ff5df3f282ad5fe28} > > }" > > > > > > > > On Fri, 2009-12-11 at 15:37 +0100, Gustaf Rydevik wrote: > >> > >> > >> On Fri, Dec 11, 2009 at 3:04 PM, Schwan<s.s.hosse...@utwente.nl> > >> wrote: > >> Thanks, but how should I put the citation inside a data frame? > >> > >> data.frame(first txt file, second txt file...) > >> plot (what should I insert here????) type="p" > >> > >> And how should I load the txt files anyway inside the frame? > >> > >> > >> > >> > >> Can you give an example of a couple of text files? Are they in a > >> standardised format (i.e. bibTEX or similar)? > >> > >> > >> /Gustaf > >> > >> -- > >> Gustaf Rydevik, M.Sci. > >> tel: +46(0)703 051 451 > >> address:Essingetorget 40,112 66 Stockholm, SE > >> skype:gustaf_rydevik > > > > > > -- ------------------------------------------- Hosseiny, MSc. S.S. (Seyed Schwan) University of Twente Science and Technology Meander, ME 322 P.O. Box 217 7500 AE Enschede The Netherlands Phone +31 534892869 Email: s.s.hosse...@utwente.n ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.