Displaying 20 results from an estimated 8000 matches similar to: "Does a formula object have a "left hand side""
2007 Aug 15
3
Formula in lm inside lapply
I am trying to run separate regressions for different groups of
observations using the lapply function. It works fine when I write the
formula inside the lm() function. But I would like to pass formulae into
lm(), so I can do multiple models more easily. I got an error message
when I tried to do that. Here is my sample code:
#generating data
x1 <- rnorm(100,1)
x2 <- rnorm(100,1)
y <-
2007 Oct 01
4
Disentagling formulas
I am writing a program in which I would like to take in a formula, change the response (Y) variable into something else, and then pass the formula, with the new Y variable to another function. That is, I am starting with
formula <- Y~X1+X2+X3
and I'd like to do something like
Y <- formula$Y
newY <- f(Y)
lm(newY~X1+X2+X3)
So far, it seems that my
2010 Nov 08
7
How to rbind list of vectors with unequal vector lengths?
Hi,
How to rbind these vectors from a list?:
> l <- list(a = c(1, 2), b = c(1, 2, 3))
> l
$a
[1] 1 2
$b
[1] 1 2 3
> do.call(rbind, l)
[,1] [,2] [,3]
a 1 2 1
b 1 2 3
Warning message:
In function (..., deparse.level = 1) :
number of columns of result is not a multiple of vector length (arg 1)
>
-J
2010 Aug 11
4
Arbitrary number of covariates in a formula
Hello!
I have something like this:
test1 <- data.frame(intx=c(4,3,1,1,2,2,3),
status=c(1,1,1,0,1,1,0),
x1=c(0,2,1,1,1,0,0),
x2=c(1,1,0,0,2,2,0),
sex=c(0,0,0,0,1,1,1))
and I can easily fit a cox model:
library(survival)
coxph(Surv(intx,status) ~ x1 + x2 + strata(sex),test1)
However, I want to
2006 Nov 01
3
matrix manipulation with a for loop
Hi,
Having a matrix F.zoo (6575,189) with NA's in some columns I'm trying to
extract from each column the percent of days within an specific range,
so I've wrote this procedure:
length(subset(F.zoo[,86],(F.zoo[,86]>=5) & (F.zoo[,86]<=
9)))/(length(F.zoo[,86])-length(subset(F.zoo[,86],is.na(F.zoo[,86]))))*100
But to do this for each column (189) is pretty hard, so I want
2010 May 23
4
creating a reverse geometric sequence
Hello,
Can anyone think of a non-iterative way to generate a decreasing geometric
sequence in R?
For example, for a hypothetical function dg, I would like:
> dg(20)
[1] 20 10 5 2 1
where I am using integer division by 2 to get each subsequent value in the
sequence.
There is of course:
dg <- function(x) {
res <- integer()
while(x >= 1) {
res <- c(res, x)
x
2013 Mar 02
2
Multiple left hand side variables in a formula
The lattice package uses special logic to allow for multiple left-hand-side
variables in a formula, e.g. y1 + y2 ~ x. Is there an elegant way to do
this outside of lattice? I'm trying to implement a data summarization
function that logically takes multiple dependent variables. The usual
invocation of model.frame( ) causes R to try to do arithmetic addition to
create a single dependent
2010 Sep 18
3
How to check the available of a package on R repo
Hi folks,
Debian 504 64-bit
What is the correct syntax to check the available of a package on R repo?
> available.packages("emacs", "OS_type=linux")
Warning: unable to access index for repository emacs
Package Version Priority Depends Imports LinkingTo Suggests Enhances
OS_type License File Repository
> available.packages("emacs")
Warning: unable
2010 May 31
0
Put two plots side by side
Two different ways:
library(ggplot2)
x=5
size=50
A=data.frame(X=sample(x, size, replace=T), Y=sample(x, size, replace=T),a=rep(1:2,each=25));A
# Facetting
qplot(X,Y,data=A) + geom_jitter(position=position_jitter(width=.03)) + facet_grid(.~a)
# Or with vp
p=qplot(X, Y, data=A) + geom_jitter(position=position_jitter(width=.03))
ggsave(p, file='main.png')
p1=qplot(X, Y, data=A) +
2010 Oct 25
2
Question on passing the subset argument to an lm wrapper
Hello,
How would you go about handling the following situation?
This is on R 2.12.0 on Ubuntu 32-bit.
I have a wrapper function to lm. I want to pass in a
subset argument. First, I just thought I'd use "...".
## make example reproducible
set.seed(123)
df1 <- data.frame(age = rnorm(100, 50, 10),
bmi = rnorm(100, 30, sd = 2))
## create a wrapper using
2010 Feb 16
3
Keyboard
All,
I installed R-2.10.1 with Readline=no. Now for some reason R does not recognize some key strokes like the directional arrows.
I am not sure if Readline is the problem or not.
I have tried .Cofigure with Readline = yes but it doesn't fix the problem nor do I really know if readline is the problem to start with.
Has anybody else run into similar problems?
Thanks,
Steve
[[alternative
2010 Oct 05
4
R editor in ubuntu!
Hello R-Users!
I am looking for an editor to be able to execute commands into R in Linux ubuntu. Is there any suggestion?
Thanks.
[[alternative HTML version deleted]]
2010 Jun 16
3
Function argument as string
Hi,
Suppose a write a function
a_fn<-function(arg1)
{
return(table(arg1));
}
I have a column called AGE. Now I call the function c = a_fn(AGE);
When a_fn is called, AGE is received in arg1. My question is, how do I
access the actual name of the argument arg1? i.e, inside the
function, i need to know that the actual name of arg1 is "AGE" in this
case.
Thanks in advance,
2011 Mar 23
3
Compare three or more values?
Is there a less cryptic way to compare three or more values?
allTheSame<-c("red","red","red","red")
notAllTheSame<-c(132,132,132,999)
all.identical <- function(vectorToTest){
cIdentical=sum(vectorToTest %in% vectorToTest[1])
return(cIdentical==length(vectorToTest))
}
all.identical(allTheSame)
all.identical(notAllTheSame)
Thanks in
2010 Aug 21
3
problems with merge() - the output has many repeated lines
Hi everyone,
I have been merging many big dataframes (about 80000 rows
each) and I never had this problem, but now it happened to
me and I want to know if someone knows what could be
happening.
The final dataframe has many rows, an impossible number! I
have done edit(dataframe) and I saw that there are many
repeated rows (all equal).
Thanks for any help,
Cec?lia Carmo
Universidade de
2006 Jul 14
1
Splitting the left and right hand terms of a formula
Let's say I have the following formula:
a.formula <- x ~ y + z
I want to extract the left and right-hand sides of the function so
that I have two character vectors like the ones you would create using
the following assignments:
left.hand.side <- "x"
right.hand.side <- c("y", "z")
One way to do this follows:
left.hand.side <-
2005 Dec 19
0
has_one mapping with arbitrary right and left hand side keys
I have two tables:
table_1:
tab1_id,
other_id
table_2:
id,
tab2_id,
something_else
I would like to specify a has_one mapping from table_1 to table_2 but
specifying that the join is based on (table_2.tab2_id =
table_1.other_id).
I am half way there with:
class Table1 < ActiveRecord::Base
set_table_name "table_1"
set_primary_key "tab1_id"
has_one :Table2, :class_name
2013 May 21
0
Arules: getting rules with only one item in the left-hand side
Hello,
I am using the package arules to generate association rules. I would like
to restrict the rules so that in the left-hand side there's only one
particular element, let's call it "potatoe".
If I do this:
rules <- apriori(dtm.mat, parameter = list(sup = 0.4, conf =
0.9,target="rules"), appearance = list(lhs = c("potatoe")))
I get "potatoe"
1999 Dec 13
1
Superscript or subscript on Left hand side of symbol
Is there a way to get subscripts and superscripts on the left hand side of
a symbol? For example, oC or oF (degree Celsius or Fahrenheit)
TIA
Partha
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2010 Apr 15
0
[LLVMdev] How to extract Left Hand side of Instruction
ambika wrote:
> Hi,
>
> Suppose I have llvm Instruction as :
>
> %9 = load i32* %b, align 4
>
> and I want to extract the name of temporary value used here ie 9.
> Can any body tell that how can I do that?
>
I believe it's the getNameStr() method.
Note that not all instructions have names (i.e., getNameStr() might give
you an empty string). I think the LLVM