Displaying 7 results from an estimated 7 matches for "ppaarrkk".
2008 Apr 25
4
Equivalent of Excel pivot tables in R
Can somebody tell me how to do the equivalent of a pivot table in R ?
For example, if I have :
var1 var2 var3
a x 10
b y 20
a z 10
b z 20
a z 10
b z 20
I could have :
x y z
a 1 0 2
b 0 1 2
where entries in the table are counts of var3.
2008 Dec 09
3
Selecting rows that are the same in separate data frames
I want to compare two matrices or data frames and select or get an index for
those rows which are the same in both. I have tried the following :
a = matrix ( 1:10, ncol = 2 )
a
b = matrix ( c ( 2,3,4,7,8,9 ), ncol = 2 )
b
a[a==b]
a = as.data.frame ( matrix ( 1:10, ncol = 2 ) )
a
b = as.data.frame ( matrix ( c ( 2,3,4,7,8,9 ), ncol = 2 ) )
b
a[a==b]
Any ideas please.
2009 Jan 13
2
Re ad a text file from a directory in which an R script finds itself
Is it possible for an R script to read a text file, say, from the directory
in which the script is located ?
I don't think I can use setwd(), because I can't specify the directory.
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2008 Jan 16
3
using an element of an array as a new object
I have an array called filesBox. I want to take each element of the first
column and assign a dataset to it.
For example :
filesBox[4,1] returns
[1] "fileR"
Then I want to assign "fileR" which exists as a text file to the R object
"fileR" like this :
filesBox[4,1] <- read.table(paste(dir2, filesBox[4,1], sep=""), header =
FALSE)
But this doesn't
2008 Nov 29
2
Using grep() to subset lines of text
I have two vectors, a and b. b is a text file. I want to find in b those
elements of a which occur at the beginning of the line in b. I have the
following code, but it only returns a value for the first value in a, but I
want both. Any ideas please.
a = c(2,3)
b = NULL
b[1] = "aaa 2 aaa"
b[2] = "2 aaa"
b[3] = "3 aaa"
b[4] = "aaa 3 aaa"
2008 Feb 07
1
How do you refer to the row above in a data frame ?
You have a two-dimensional data frame.
Columns is easy, say
col4 <- col3 - col2
How do you do
row3 <- row2 +1
for example.
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2008 Oct 23
1
save an object of class "im"
I have created various "im" objects, but can't seem to save and load them. I
can save them, but as small files of less than 1Kb. Therefore, when they are
re-loaded, they cannot be plotted as images.
Any ideas please.
Thankyou.
Simon Parker
Imperial College
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