similar to: storing text and decimal values in a matrix form

Hi Gon?alo Ferraz <gferraz29 at gmail.com> napsal dne 11.09.2007 16:35:57: > Thanks! What is the easiest way of declaring an empty data frame. Is there > anything similar to: > matrix(0,x,y) > In the help files, I am only finding longer commands that ask me to specify > each individual column. You can either do dat<-data.frame(x=rep(NA,10), y=rep(NA,10)) or to

Why doesn't this work? #Drop a variable name from a data frame DropLikeSAS <- function(x,df) { df[[x]] <- NULL 0 } DropLikeSAS("VarName", DataFrameName) Try it. The column VarName will not be deleted from the data frame DataFrameName. But x <-

I'm using 1.9.0 on Windoze 2k and I created a numeric matrix and used colnames() to give it some column names, but if I try to select a column using matrixname$validname I get a null return but if I use matrixname[,4] it works fine. Looking at the help I think this is because a matrix is not a recursive structure and I think it's saying I shouldn't be surprised nor attempt this.

For the 1000 simulations, a matrix will be generated each time. And, I need to choose the first row of the generated matrix. The following loop doesn't work though: for (i in 1:1000) { aval[i]<- matrixname[1,] } Any solution? thanks!

Hey everybody, I am looking for a way to loop commands over several variables in a dataframe. Basically I want to do something like this: ti1<-aggregate(dataframename$y1, by=data.frame(dataframename$aggregationvar), sum,na.rm=TRUE) This works fine as it is but i want to do it for several variables thereby generating several tix. I tried with a for-loop but the

Hi, Anyone knows what would be a short way of extracting a month from a date in numeric or integer format? months("1979-12-20") returns "December" in character format. How could I get 12 in numeric or integer format? Thanks! G. [[alternative HTML version deleted]]

Hi, I want to write a matrix (n*m) in a file (Text file) such that the file will be as Result file (below). I use the below command but it write all numbers in one column, > write(paste(matrixname),file="test.txt",append=TRUE) how can I do this? Result file: 5 5 -1 -1 -1 -1 8 8 2 7 6 5 6 6 8 2 7 5 Matrix: [,1] [,2] [,3] [,4] [,5]

Hi, Imagine a vector x with elements (1,2,1,1,3,5,3,3,1) and a vector y with elements (2,3). I need to find out what elements of x match any of the elements of y. Is there a simple command that will return a vector with elements (F,T,F,F,T,F,T,T,F). Ideally, I would like a solution that works with dataframe colums as well. I have tried x==y and it doesn't work. x==any(y) doesn't work

Hi, I have a cloud of randomly distributed points in 2-dimensional space and want to set up a grid, with a given grid-cell size, that minimizes the distance between my points and the grid nodes. Does anyone know of an R function or toolbox that somehow addresses this problem? This is a problem of optimizing the location of the grid, not a problem of deciding what should be the grid-cell size,

Hello. I want to print the value a matrix has. The matrix's size is not too big (100*100 cells). I tried print(matrixname) but as it does not fit very well on my screen R splits it into several small matrixes that do overflow my screen. IS it possible somehow to display this matrix as one (even if this needs to go fullscreen) . There might be some function for that like plot cells or

I am attempting to add a calculated column to a data frame. Basically, adding a column called "newcol2" which are the stock closing prices from 1 day to the next. The one little hang up is the name of the column. There seems to be an additional data column name included in the attributes (dimnames?). So when i run HEAD(DATAFRAMENAME) i get the column name = "Open". but

Hi, I am writing a for loop that creates one object, say 'outn' on every round of the loop. I would like the name of each object to include the index of the loop as in, for example: out1, out2, out3, ... And I would like the naming of the object to take place automatically as the loop moves through? Similarly, I would like to be able to call different objects (in1, in2, in3,

Dear All, How can I sort a data frame (using one of the column)? Thanks for your support. Regards. Abd. Rahman Kassim (PhD) Head Forest Ecology Branch Forest Management & Ecology Program Forestry and Conservation Division Forest Research Institute Malaysia Kepong 52109 Selangor, Malaysia ***************************************** Checked by TrendMicro Interscan Messaging Security. For any

Hi, I have a data.frame SAMPLES with columns: Site Site# Season Day1 Day2 Day3 Day1, Day2, Day3 are class "Date", the other columns are numeric or factor. I have a date "mydate" that may or may not be listed in my data.frame and I need to find that out. If "mydate" is there, I want to get the number of the data.frame row where it occurs.

Hi: When debugging some floating point assembly, we found it is inconvenient to read the decimal constants in assembly. In hex form many FP numbers are immediately recognizable, their exponents are more obvious etc. We normally use hex form in debugger or LLVM IR, not sure what is the reason that we want to use decimal in assembly? The form change won't change precision or affecting

I have an odd bug in one of my applications. When I am using the sqlite3 database the bug is not present. However when I use mysql2 as the database adapter I run into an error saving decimal values from a form. If I submit the value 19.99 my input after the decimal is removed and it is stored in the database as 19.00 What would cause this? The database has the correct settings for the column and

I receive GPS readings in a text string such as "0121.6723S 03643.6893E" and need the coordinates as decimal degrees in two separate variables: "-1.361205" and "36.728155". How do I do this in R? mikkel

Good Day, I have the following: >Date<-c("08/05/08","08/06/08","08/07/08") >Weight<-c(209.4,211.8,210.0) >planned.meal<-cbind(Date,Weight) >planned.meal Date Weight 1 08/05/08, 209.4 2 08/06/08, 211.8 3 08/07/08, 210.0 >write.table(planned.meal, file="plannedMeal1.txt", + quote=FALSE, row.names=FALSE) output on

Hi, I have: a <- matrix(c(0,1,0,1),nrow=2) b <- matrix(c(1,1,1,0,0,0),nrow=3) c <- 1 d <- c(1,0,1) And I would like to join them in an object 'thing' so that I can access a, b, c, or d through an index in a for loop. For example: thing[4] would return [1] 1 0 1 Note however, that I have many of these 'thing' components. So many that a command like thing

Hi, If I have a data frame A with the following format: Day1 Day2 Day3 Day4 1 1979-11-02 1979-11-03 1979-11-04 <NA> 2 1979-12-06 <NA> <NA> <NA> 3 1979-12-13 1979-12-14 1979-12-15 1979-12-16 4 1979-12-20 <NA> <NA> <NA> And a date "1979-12-14", for