search for: mathematically

Hello, My data is "study.txt": "Not A" "A" "Mathematics" 80 15 "Physics" 32 24 "Biology" 18 29 I want to transform this data into with column names 'course' and 'A': course A 1 Mathematics 1 2 Mathematics 1 ..

Hi, Has anyone come across a Ruby mathematical expression parser, capable of parsing out token, replacing them with values then executing the mathematical formula? Nothing too heavy, A * (44/12) * ... etc. where A is can be replaced with a value. In Java there are serveral, like JEP, but I''d prefer it we could get a Ruby one now we have moved over to Rails, otherwise we will have to

Hi all, For those interested, while scanning /. tonight, I came across a posting which referred to a new editorial in the November 2007 Notices of the American Mathematical Society: Open Source Mathematical Software by David Joyner and William Stein http://www.ams.org/notices/200710/tx071001279p.pdf Although brief, it makes for interesting reading. Regards, Marc Schwartz

[[ this has first bounced to me as 'list-manager', because the subject said ``Returned mail: User unknown'' Paul, I assume you'd approve the subject I've chosen... -- Martin M ]] hi for those who are interested ... the following is a LaTeX document which describes the current state of mathematical expression syntax in R paul ------CUT

May I recommend my new book on mathematical modeling to you, which is based on R as a main software tool: Kai Velten: Mathematical Modeling and Simulation, Wiley-VCH, 2009, ISBN 978-3527407583. See also: http://www.wiley.com/WileyCDA/WileyTitle/productCd-3527407588.html http://books.google.com/books?id=Czp1N5UWpyEC List of reviews below. The book covers a broad range of mathematical models

Hi everyone, I am writing help files for some R functions in an R package. I am wondering if we can use the Latex mathematical formula when editing those *.Rd files and then obtain a pdf manual with beautiful mathematical formula. I tried it with the default R CMD check command but could not get the desired mathematical formula. That is, $f(x)$ is not recognized as a math formulas. I think the

Hi, I am working with the lattice package and I want to label to groups in the xyplots with mathematical expressions. I short example for this library(lattice) Case<-factor(rep(1:2,each=300)) xx<-rnorm(600,0,1) yy<-rnorm(600,0,1) xyplot(yy~xx|Case) This results in two scatter plots with label "1" and "2". I would like to substitute this labels by math expression. I

Dear R-users, I'm trying to add a title on a plot with both mathematical notation and values substitution. I read the documentation and search the mailing list but I was not able to solve my problem. Actually, there is a message by Uwe Ligges on June 2003 which addresses a question very close to mine, but the code provided doesn't work. The code is the following: # I add this to let you

Hello, I'm trying to put a mathematical expression into a legend, but R complains about a syntax error. Basically i'd like to do this: legend.text = c(expression(x < 10), expression(x >= 10)) The manual says that one can only pass mathematical expressions to axis, text etc. but not to the legend command? Is there a workaround for this? thanks a lot for help, Arne -- Arne

Hi to all I use a loop to plot 9 different histograms of 9 different transformations of one dataset (x). I want to label the histograms with the mathematical expression of each transformation (e.g. x^3). For that I've prepared a vector with the labeling names for "expression". > trans.expr <- c("x^3", "x^2", "x", "frac(1,x)",

How can I insert mathematical expressions for variable names in a lattice parallel plot? I tried to implement mathematical expressions in varnames, however, without success. For example, neither parallel(~iris[1:4] | Species, iris, varnames=c("P[Width]", "Petal[length]", "alpha[Width]", "Sepal[Length]")) nor parallel(~iris[1:4] | Species,

"CALL FOR PAPERS" THE ISLAMIC SOCIETY IN SOUTH EAST ASIA CONFERENCE ON STATISTICAL AND MATHEMATICAL SCIENCES BANDUNG, 25 - 26 APRIL 2003 Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Islam Bandung Jalan Tamansari No. 1, Bandung 40116 Telepon +62 22 4203368 Ext. 136 or 135 Facsimile +62 22 4263895 E-mail: - fmipa_unisba at yahoo.com - wanda at

Hello everyone! I'm trying to plot some mathematical expression along my axis, but demo(plotmath) did not have the symbol I was looking for. In particular, I would like to denote the mean of an observable by writing <k> which I tried to enter with expression(group("<", k, ">")) However, my naive try doesn't work and the help doesn't want to tell me,

inputfille snpid indid genotype gvariable probeid gene geneexpression rs1040480 CHB_NA18524 C/T 2 GI_19743926-I PTPRT 5.850586 rs1040480 CHB_NA18526 C/C 1 GI_19743926-I PTPRT 6.028641 rs1040480 CHB_NA18529 C/C 3 GI_19743926-I PTPRT 5.944392 rs1040481 CHB_NA18532 C/C 1 GI_19743926-I PTPRT 5.938578 rs1040481 CHB_NA18537 C/C 2 GI_19743926-I PTPRT 5.874439 rs1040481 CHB_NA18540 C/C 3 GI_19743926-I

JOB: Statistical and Mathematical Modelling in the Energy and Environment Sectors Quintessa (www.quintessa.org) is an employee-owned company that undertakes high-quality science-based consultancy, research and software development for industry and governments around the world in the energy and environment sectors. Statistical and mathematical modelling of complex systems (ranging from geological

Hi everybody, my goal is to display symbols on the x-axis of a barplot. I read some mathematics strings in a file and convert them to an expression as follows: tt<- scan(file = fstr ,'what' ='character', sep = ""); for (iaa in 1:length(tt)) { tt[iaa]<-do.call(expression, lapply(tt[iaa], as.name)); } I obtained the following result: tt =

Does this approach what you're looking for? See ?is.finite for more info > LBAuo<- -9999 > LBAuo [1] -9999 > if (LBAuo <= -9999) LBAuo <- -Inf > LBAuo [1] -Inf > HTH Steven McKinney > -----Original Message----- > From: r-help-bounces at r-project.org [mailto:r-help-bounces at r- > project.org] On Behalf Of Mary A. Marion > Sent: Wednesday, July 22, 2009

On Fri, 12 Mar 2004 11:44:14 -0500, "Roger D. Peng" <rpeng@jhsph.edu> wrote : >Funny, it works for me on R-patched > > > f <- function(a) { return(log(a)) } > > f("A") >Error in log(x) : Non-numeric argument to mathematical function > > traceback() >2: log(a) >1: f("A") > > try(f("A")) >Error in log(x) :

Hello, I have to add "Age (bar(x)=14.3) as a title on a chart. I am unable to get this to working. I have tried bquote, substitute and expression, but they are only doing a part of the job. new<- c(14.3, 18.5, 18.1, 17.7, 18, 15.9, 19.6, 17.3, 17.8, 17.5, 15.4, 16.3, 15, 17.1, 17.1, 16.4, 15.2, 16.7, 16.7, 16.9, 14.5, 16.6, 15.8, 15.2, 16.2, 15.6, 15, 17.1, 16.7, 15.6, 15, 15.8, 16.8,

Hi, I'd like to make a legend with a mix of mathematical symbol (tau), numeric variable and character variables.I have tried : types<-c("Type 1","Type 2","Type 2") tau<-c(1,3,2) legend(x="topright",legend=paste(types,"tau=",expression(tau))) but it doesn't work: the 'tau' symbol is not written in its 'symbol