Displaying 4 results from an estimated 4 matches for "mylevel".
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mylevels
2003 Oct 02
3
indexing a vector
Dear All:
I'd like to know how to sort and then index a vector of floats by several
levels in R.
For example
>x<-rnorm(100)
> MyLevels<-quantile(x,probs=c(0,.5,1))
> MyLevels
0% 50% 100%
-2.11978442 -0.03770613 2.00186397
next i want to replace each x[i] in x by 1,2,3 or 4 depending on which
quantile that x[i] falls. How do I do that in a "vector" fashion?
I tried something like
>f...
2009 May 06
4
tapply changing order of factor levels?
Hi,
Does tapply change the order when applied on a factor? Below is the code I
tried.
> mylevels<-c("IN0020020155","IN0019800021","IN0020020064")
>
mydata<-c("IN0020020155","IN0019800021","IN0020020064","IN0020020155","IN0019800021","IN0019800021","IN0020020064","IN0020020064"...
2007 Jun 08
1
How to make a table of a desired dimension
Hi ComRades,
I want to make a matrix of frequencies from vectors of a continuous
variable spanning different values. For example this code
x<-c(runif(100,10,40),runif(100,43,55))
y<-c(runif(100,7,35),runif(100,37,50))
z<-c(runif(100,10,42),runif(100,45,52))
a<-table(ceiling(x))
b<-table(ceiling(y))
c<-table(ceiling(z))
a
b
c
will give me three tables that start and end at
2011 Nov 04
2
Efficiency of factor objects
....time(replicate(1e4,{q1<-f1[100:200];1}))
user system elapsed
0.67 0.00 0.68
Putting the levels vector in an environment speeds up subsetting:
myfactor <- function(...) {
f <- factor(...)
g <- unclass(f)
class(g) <- "myfactor"
attr(g,"mylevels") <- as.environment(list(levels=attr(f,"mylevels")))
g }
`[.myfactor` <-
function (x, ...)
{
y <- NextMethod("[")
attributes(y) <- attributes(x)
y
}
> m1 <- myfactor(f1)
> system.time(replicate(1e4,{q1<-m1[100:200];1}))
user sy...