search for: intersection

useR's, First, I would like to say thanks to John Fox for providing this segment of code to perform intersection for multiple sets: intersection <- function(x, y, ...){ if (missing(...)) intersect(x, y) else intersect(x, intersection(y, ...)) } I want to execute this function on the rows of a matrix I have: Ik.mat.test <- matrix(c(2,3,6,1,2,6,6,1,2),byrow=T,nrow=3) > Ik.mat.test [,1] [,2] [,...

v1<-c("a","b","c","d") v2<-c("a","b","e") v3<-c("a","f","g") I want to get the intersection of v1,v2,v3,ie "a" How can I do then? What I know is only for 2 vectors via "intersect" function,but don't know how to deal with multiple vectors. Many thanks [[alternative HTML version deleted]]

...art Point if (source.p=="r") {source<-c(rnorm(1,source.mean,source.sd),rnorm(1,source.mean,source.sd))} else {source<-source.p} cat("The location of the source is: ",source,"\n") ##Generate the data remainder<-num.points initial.sample<-c(1,1) ##finds intersection points with the screen intersect.screen.at<-function(x,h){ t<-h[1]/(2*cos(x)) x.intercept<-t*sin(x[,2])*cos(x[,1]) y.intercept<-t*sin(x[,2])*sin(x[,1]) } ##finds intersection points with the collecting plate intersect.plate.at<-function(x,h){ t<-h[2]/(2*cos(x))...

Hi all, I don't know if this is the correct venue for this question, but I am sure that someone will correct me if I am in the wrong list. I have been searching throughout R for a function that can find the intersection of multiple sets of "things". Say for instance, I have a list of $n$ character vectors and would like to find the intersection of all $k$ subsets. I don't believe that there is such a function to do this (or am I wrong?). It is a pretty easy to encode such a function...there was an e-...

> intersect(c(1,3,2),c('1','3')) [1] "1" "3" Apparently, intersect() treats num as string. But this is not documented in the help. Could somebody add it in the future version of R? Also according to the help, the argument should not have duplicated elements. But I tried the following example, it seems that it doesn't matter where there are duplicated

Hi all, As far as I can tell, the only canned way to do an intersect between two vectors of ints is the intersect(vec1, vec2) function -- is there another function I'm missing for intersecting more than two vectors?? TIA, Ken

...length=100) plot(x,p1,type='n',ylab="Density",main="Overlap Measure",xaxt="n",yaxt="n") pi=dnorm(x,0,1) points(x,p1,type='l') abline(0.07,0.01) you can see that the curves intersects at 3 points. My question is how do I mark the point of the intersection? I like to mark it as (x1,y1) as the first point of intersection and so on. or I can just mark the x-coordinate of the 1st intersection as x1 on the x-axis. Thanks, lavan -- View this message in context: http://www.nabble.com/Point-of-intersection-tp19791632p19791632.html Sent from the R help m...

Hi I have probably a very simple question but I'm going crazy trying to find the solution. I have two data.frames with headers and I'm doing an intersection between them by names, such that the intersected data.frames are returned by: df1[intersect(names (df1), names(df2))] and the same for df2 Now, I want to have all the opposite data that did not intersect. I tried to do: df1[-intersect(names (df1), names(df2))] and some other stuff but it didn&...

Hi, Sorry for the very short explanation about the problem of intersection. I have a wave function monitored from the heart beat in a particular interval of times.?Apart?fom that, there is?a line with positive slope (e.g: y = x+2) which lies across the wave and intersect on a number of points. My problem is i have no exact equation for?such a?complex harmonic wave p...

...http://r.789695.n4.nabble.com/file/n4675136/example.csv> . In my example, I have a reference list of fruit (first column), and my fruit of interest (second column), and then in the third column, I have color information about the fruit of interest in the second column. Currently to find the intersection between column 1 and 2, I use >fruit<-read.csv("//Users//J//Desktop//example.csv", header=TRUE) >output<-intersect(fruit[,1],fruit[,2]) >write.table(data.frame(fruit),"output.xls", col.names=TRUE, row.names=FALSE) However, it would save me a lot of time if I cou...

This code gives an error: a <- ts(1:10, start=0, freq=10) b <- ts(1:10, start=1, freq=10) ts.intersect(a,b) This one works normally (and correctly): a <- ts(1:10, start=0) b <- ts(1:10, start=1) ts.intersect(a,b) Antonio, Fabio Di Narzo. P.S. How to switch off italian error messages to post on r-help? > version _ platform i386-pc-mingw32 arch i386 os

...ot;y" is missing, with no default > CiS<-intersect(read.frame(c,s)) Error in unique(y[match(x, y, 0)]) : Argument "y" is missing, with no default ##### Why am I getting this error. Second thing I did: I loaded the data as data.frame instead read.table(). Again I never get intersection of C,E and S,H. Can any one please help me. thank you SP

How can I create intersections of vectors? a <- c(1,2,3) b <- c(1,5,6) the intersected list c should contain c(1)... Ralf

Hi, Is there a command to get the indices of intersecting elements of two vectors as intersect() will give the elements and not its indices. Thanks in advance. Praveen Surendran School of Medicine and Medical Sciences University College Dublin Belfield, Dublin 4 Ireland. [[alternative HTML version deleted]]

Know that if I have List_1 and List_2 that I can check to see if the intersect via the code below: List _1: a, b, c, d, e, f, g List_2: z, y, x, w, v, u, b length(intersect(List_1, List_2)) > 0 return = true If instead I wanted to check a dataframe that is a "list of lists," how would I do that by record without looping? List _1: a, b, c, d, e, f, g List_2: z, y, x, w, v,

Hi, I searched the archives and did not find a good solution to that. assume I have 10 sets and I want to have the common character elements of them. how could i do that? -- Weiwei Shi, Ph.D Research Scientist GeneGO, Inc. "Did you always know?" "No, I did not. But I believed..." ---Matrix III

I'm still learning how to program with R and I was hoping someone could take the time to show me how I can rewrite this code? Many thanks Tom data.intersects<-data.frame( x=c(0.230,0.411,0.477,0.241,0.552,0.230), y=c(0.119,0.515,0.261,0.431,0.304,0.389), angle=vector(length=6), length=vector(length=6),

Hi all, The ?intersect entry kindly points out that it discards duplicate entries. I'm looking, however, to get the intersection while KEEPING duplicate entries, and there are no instructions on how to accomplish this using intersect(). Does anybody have any idea how this might be done, or am I going to need to program something from scratch (something like ordering the vectors and then looping through them)? ex: > a...

Hi, I want to merge multiple chromosomal regions based on their common intersecting regions. I tried couple of things using while and if loops but did not work out. I would appreciate if anyone could provide me a small piece of code in R to get the intersection of following example: chr1: 100-150 chr1: 79-250 chr1: 100-175 chr1: 300-350 I want the intersection of all four regions as follow: chr1: 100-150 chr1: 300-350 I have thousands of these regions (some overlap and some not). Regards, --Yadav [[alternative HTML version deleted]]

Hi, I would like to find out the coordinates of the intersection points of 2 density curves. I did a search but i didn't get any significant results. I really hope some of you have some ideas. here it is an example: set.seed(123) x1 <- rnorm(100, 1, 1) x2 <- rnorm(100, 0, 1) d1 <- density(x1) d2 <- density(x2) plot(d1, col = 2) lines(d2, col...