Displaying 20 results from an estimated 2000 matches similar to: "Split data.frames depeding values of a column"
2009 May 14
2
Function to read a string as the variables as opposed to taking the string name as the variable
I am writing a custom function that uses an R-function from the
reshape package: cast. However, my question could be applicable to
any R function.
Normally one writes the arguments directly into a function, e.g.:
result=cast(table1, column1 + column2 + column3 ~ column4,
mean) (1)
I need to be able to write this statement as follows:
result=cast(table1, string_with_columns ~
2010 Feb 27
1
New Variable from Several Existing Variables
I am new to R, but have been using SAS for years. In this transition period,
I am finding myself pulling my hair out to do some of the simplest things.
An example of this is that I need to generate a new variable based on the
outcome of several existing variables in a data row. In other words, if the
variable in all three existing columns are "Yes", then then the new variable
should
2013 Mar 21
2
Displaying median value over the horizontal(median)line in the boxplot
Hi,
set.seed(45)
test1<-data.frame(columnA=rnorm(7,45),columnB=rnorm(7,10)) #used an example probably similar to your actual data
apply(test1,2,function(x) sprintf("%.1f",median(x)))
#columnA columnB
# "44.5"? "10.2"
par(mfrow=c(1,2))
lapply(test1,function(x) {b<-
2004 Oct 25
2
Reading sections of data files based on pattern matching
I am about to write general functions to read the output of simulations
models.
These model generate output files with different sections which I want
to analyze plot etc.
Since this will be used many people at the department I wanted to make
sure that will do this in the best way.
For instance I want to read a snippets of data from a text that look
like this.
2006 Apr 06
1
reshape question
Hi,
I have a data fram like this:
date column1 column2 column3 value1 value2 value3
1-1 A B C 10 5 2
2-1 A B D 5 2 0
3-1 A B E 17 10 7
How can I reshape it to:
date column1 column2 column3 v x
1-1 A B C value1 10
1-1 A B C value2 5
1-1 A B C value3 2
2-1 A B D value1 5
2-1 A B D value2 2
2-1 A B D value3 0
3-1 A B E value1 17
3-1 A B E value2 10
3-1 A B E value3 7
Thx!
Regards,
Richard
2009 Jul 07
2
How to separate the string?
Hi everyone,
Hi want to separate the string(column1) for example
column1 column2 column3 column4 column5 column6
bear b e a r
cat c a t
tiger t i g e r
I know how to do this in excel where using MID function.
Now I want to solve it using R. The list of strings is in
2010 Feb 09
3
split strings in a vector and convert it to a data.frame
hi,
I have a vector full of strings like;
xy_100_ab xy_101_ab xy_102_ab xy_103_ab
I want to seperate each string in three pieces and the separator should be the "_"
at the end I want a data.frame like:
column1 column2 column3
xy 100 ab
xy 101 ab
xy 102 ab
xy 103 ab
I tried strsplit but I couldn't figure out how to convert the list I get into a data.frame.
I just
2012 Jun 12
4
How to index a matrix with different row-number for each column?
here's my question: suppose I have a matrix:
mt<-matrix(1:12,ncol=6)
now I have a vector
vt<-c(1,2,2,2,1,2)
which means I want to get:
the 1st row for column1;
the 2nd row for column2;
the 2nd row for column3;
the 2nd row for column4;
...
that what I want is this vector:
1,4,6,8,9,12
Does anyone know how to do this fast?
I know I can use for-loop to travel all columns,but
2009 Aug 03
2
Some SQL Challenges
Hi,
Im trying to complete a list of jobs using SQL Querries and some "if else"
commands but im stucked in some steps. Could any of you give me some help?
-in COLUMN1 change the format 20JAN2000:00:00:00 to 20JAN2000 and exclude
every row that date is different from 20.
-extract the first character in COLUMN2 and creat COLUMN3 with that value
ex:
COL2,COL3
135,1
461,4
247,2
-in every
2009 Dec 03
2
Dataframe help
Hi there
I have two dataframes
Dataframe_1
column_1 colum_2
121 12345
145 1675
167 2765
Dataframe_2
column_1 column2
121 abc
345 lmn
167 efg
I want a resulting dataframe
121 12345 abc
167 2765 efg
how do i go abt it
Ramya
--
View this message in context: http://n4.nabble.com/Dataframe-help-tp947934p947934.html
Sent from the R
2003 Aug 07
2
Question about 'NA'
Hi all,
Ive got a database with 10 columns (different
variables) for 100 subjects, each column with
different # of NA's. I'd like to know if it is
possible to use a function to exclude the NA's using
only a specific column, lets say:
Data2 <- omit.exclude(Data1$column1) ??, then
Data3 <- omit.exclude(Data1$column2) and so on
I tried the code above but with no results
Thanks
2004 Nov 23
5
number of pairwise present data in matrix with missings
is there a smart way of determining the number of pairwise present data
in a data matrix with missings (maybe as a by-product of some
statistical function?)
so far, i used several loops like:
for (column1 in 1:99) {
for (column2 in 2:100) {
for (row in 1:500) {
if (!is.na(matrix[row,column1]) & !is.na(matrix[row,column2])) {
pairs[col1,col2] <- pairs[col1,col2]+1
2006 May 09
9
Active Record HELP!!!!!
Hello,
Can someone kindly tell what the heck creating a relationship does in
active record?
I understand the idea of joining the tables and such. But how do I use
it? Is it available in a scaffold? How about when I want to view a
record and want to see all the joined data from the other table? Do I
have to manually code the data I want from the other table? Does this
automatically make the
2009 Jun 15
2
Help with syntax error
Hi,
I have written boxplot commands of this form before, but I don''t quite understand why the function call is reporting a syntax error in this instance. All parameters passed to the function are strings.
Thanks in advance.
Payam
> simplevar <- function(wframe,column1,column2) {
+ tframe <- get(wframe)
+ x1 <- which(names(wframe)==column1)
+ x2 <-
2010 May 31
2
accessing a data frame with row names
Readers,
I have entered a file into r:
,column1,column2
row1,0.1,0.2
row2,0.3,0.4
using the command:
dataframe<-read.table("/path/to/file.csv",header=T,row.names=1)
When I try the command:
dataframe[,2]
I receive the response:
NULL
I was expecting:
row1 0.2
row2 0.4
What is my error with the syntax please?
Yours,
r251
mandriva2009
2006 Apr 20
0
parsing arguments of a function
Hi,
I have a simple problem writing a function that is to be called like
Myfunction( Column1 = low, Column2 = high, Column3 = all, Column4 = all,
data = mydata)
{.
contourplot(z ~ mydata$Column3* mydata$Column3)
.
}
Where Column1 and Column1 are the names of the dataframe mydata.
How do I parse the arguments to obtain both, name and value of the
argument.
I tried strsplit(Column1,
2006 Jan 04
3
matrix math
I am using R 2.1.1 in an windows XP environment.
I have 2 dataframes, temp1 and temp2.
Each dataframe has 20 variables (“cocolumns") and 525 observations (“rows”). All variables are numeric.
I want to create a new dataframe that also has 20 columns and 525 rows. The values in this dataframe should be the sum of the 2 other dataframe.
(i.e. temp1$column
2009 Jun 17
6
script help
Hi
?
I have a file. list.txt (two columns)
?
column1??? column2
name??????? address
?
?
I need to put in the letter file letter.txt eg:
?
Dear: Chloe
Address: CA
?
Can I use this
?
for i `cat list.txt` | sed 's/Chloe/$i.1; /CA/$i.2/g' $i.letter.txt
?
Thank you for your help
?
?
?
?
?
__________________________________________________________________
Looking for the perfect gift?
2010 Oct 04
1
Splitting a DF into rows according to a column
Hi,
I'm turning my wheels on this and keep coming around to the same wrong
solution - please have a look and give a hand ...
The premise is: a DF like so
> loremIpsum <- "Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Quisque leo ipsum, ultricies scelerisque volutpat non, volutpat et nulla.
Curabitur consequat ullamcorper tellus id imperdiet. Duis semper malesuada
2007 Oct 19
1
(no subject)
# Hello
# I have a question regarding pairwise calculations of a matrix using a
"for-loop."
# Below I have a matrix "X" with 8 columns. These are Genotypic data so
Column1 & Column2 is
# a unit, Column3 & Column4 is a unit, Column5 & Column6 is a unit, and
Coulmn7 & 8 is a unit.
# I have a loop designed to calculate the number of times an individual in