search for: kevinchang

Hey, I am trying to make a data frame and the name of a column is composed of a number, a dot, and a word, such as "1.whatever". But I always get this error message:"syntax error, unexpected SYMBOL, expecting ',' in:" while printing data frame out . When I rename the column with purely letter, everything works fine. Some suggestion about the cause/ solution ?? Thanks.

Hi R users, I am wondering if it there is any R's function helping integrate venn diagram and pie chart to compare two related datasets. I know the package limma(bioconductor) has something built-in for making venn diagram, but I guess it would be very painful to use line and text to specify the proportions in the fashion of pie chart . Thanks in advance, Kevin Chang -- View this

Hi all, Since proc.time return three different kind of times (user, system and elapsed) , I am wondering which one is right for calculating flops. In New S Language (Becker et. al. ) , it seems to be the user because " the user time measures the processor time used in S and the system time measures the operating system in response to S's request". But in R Help , system time

I heard that if-loop may result in errors if we are going to loop for a lot of times. And sum() can be the alternative way to do this kind of hugbe looping. But I haven't figure out how . Can someone please give me an concrete example of using sum() for this purpose? -- View this message in context: http://www.nabble.com/alternative-way-to-loop-tf4422299.html#a12613696 Sent from the R help

Hi R users, I am using built-in functions in igraph package to draw networks . I need to compare several network with exactly the same structure but with edge hightlighted differently. I am wondering if there is a way to save the layout so that every graph will look the same as each other except for the colors of edges. Or is there any parameter I can set for this purpose?? Thanks in advance,

Hi All, I am trying to rearrange alphabetically each element in a character vector. ex: say the first element in the vector is "cba", and my goal is to turn it into "abc". The suggested function to use is sort(). But it turns out that sort doesn't work at the level of element. So I am wondering that if there is an alternative function for this purpose. Please help me out .

Hi, The loop I wrote executes correctly but is stalled seriously. Is there a way to hasten execution without coming up with a brand new algorithm ? please help. Thanks. -- View this message in context: http://www.nabble.com/stalled-loop-tf4451301.html#a12699524 Sent from the R help mailing list archive at Nabble.com.

Dear R users, I am trying to call a Perl subroutine from R . The subroutine returns an arrray contaning three elements wihch are all strings. But the calling in R return an integer which is 0. I have no idea how this could happen. Maybe becasue I shouldn't use system() in R or I should load a particular package for my R in windows. Please help ....

Dear R users, I am trying to draw a network using igraph package. I intend to place the hub nodes (the ones with the relatively more connection with other nodes) in the center of the graph. Also, the graph need to be in the fashion that the higher the correlation between two nodes is , the closer the two nodes will be. Is there any layout that can help or any other way to do this? Thanks in

Hi R users, I am trying generate the indices for locating a in the string it come from. Given the length of the string, it will take too long using the combn() for further comparison. I am wondering if R has any built-in function for this purpose. To make it concrete: this.substring="cc" this.string="ccc" start.location=1,2 end.location=2,3 Thanks in advance, Kevin

Hi all, I am using R trying to get a inverse matrix of (X^T)X , but I keep getting the error message like: no b argument and no default value for sprintf(gettext(fmt, domain = domain), ...) . -------------------------------------------------------------------------------------------- # my code X<-Matrix(rep(1,500),100,5) X[lower.tri(X)]<-1-10^-7 XtX<- t(X)%*% X XtXu<-lu(XtX)

Hi all, I am coding for finding the root of f(x)= phi(x) -alpha where phi(x) is the cumulative density function and alpha is constant . The problem right now is I can't get the "initialX" representing the root out of the while loop when ending , it seems to me it disappear when the loop ends accroding to the error message. I need help . Please suggest the cause or solution to this