Displaying 20 results from an estimated 30000 matches similar to: "add string to a list"
2012 Feb 01
6
While loop working with TRUE/FALSE?
Hi R users,
is there any possibilty that a while loop is working like that:
z <- c(0,1,2,3,4,5,6,7,8,9)
r <- 7
while(w == T) {
for ( i in 1:10 ){
w <- r == z[i]
print(w)
}
}
The loop should stop if w == TRUE
best regards
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2008 Oct 22
3
Substitute problem
hello R users,
I didn't find a solution for a special problem.
I have two dataframes.
dataframe1:
X value row col ID
1 8.973498062 5512625 3460000 1
2 11.656658570 5501625 3464000 2
3 11.121777570 5495625 3473000 3
4 9.310465964 5508625 3477000 4
5 8.883483845 5515625 3496000 5
dataframe2:
X value
2008 Nov 10
2
Make one vector from matrix comparison
Hello R-users,
I have a little problem.
I compare each row of a matrix with each row of another matrix.
testmat1 <- matrix(c(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16), nrow=4)
testmat2 <- matrix(c(1,2,3,5,5,6,7,8,9,10,11,12,13,14,15,16), nrow=4)
Both matrix differs in the last row.
Now I create a loop:
for (i in (1:4)){
for (j in (1:4)){
b <- (c(setequal(testmat1[j,],testmat2[i,])))
2011 Nov 15
2
points() colored by value
Hi R users,
I want to colored points by their value
for example:
x <- c(1,2,3,4)
y <- c(1,2,3,4)
z <- c(2,3,4,9)
y and x are coordinates
z is the value of the coordinates
points(x,y,col= rainbow(z))
something like that
But haven't found any solution at the moment.
Thanks.
Chris
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2008 Sep 17
1
Re adout row and column of a matrix value
Hello R users,
I want to readout the row and column postion from a certain matrix value
into a csv file.
I have only found this syntax
"which(a == b, arr.ind = T)"
so I get
a = matrix
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8]
[1,] 1 1 2 2 2 1 1 2
[2,] 1 2 3 3 3 4 4 3
[3,] 3 3 3 5 5 6 5 4
[4,] 4 4 4 3
2011 Feb 03
2
substring and paste character with a for loop
Hello R users,
I have a little problem with a for loop.
Below there is an simple example of my problem.
I want to delet the commas in the character string. Fore this reason I
create a for loop to unpick the string and rebuild him without the commas.
The problem is, that "paste" does not work in the loop as I expected.
text <- "aaa,bbb,ccc,ddd"
characterseq <-
2013 Apr 16
2
R process slow down after a amount of time
Hi R users,
I have mentioned that R is getting slower if a process with a loop runs for
a while. Is that normal?
Let's say, I have a code which produce an output file after one loop run.
Now after 10, 15 or 20 loop runs the time between the created files is
stongly increasing.
Is there maybe any data which fill some memory?
Chris
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2011 Sep 16
3
How to save row values from a matrix into one vector?
Dear R users,
I guess, I have a quit simple problem, but I'm not getting the solution.
I create a matrix like this:
test <- matrix(seq(1,3,1),ncol=5,nrow=3)
then I want to create one vector, consisting of every row of the matrix.
My first idea was to do this with a for loop.
op <- vector()
for (o in 1:3){
op[o] <- as.vector(test.id[o,])
}
The results should be like this:
[1]
2008 Sep 21
1
Searching a relativ maximum of a matrix
Hello R users,
is there a possibility to get the relativ maximum of a matrix?
To get the absolut maximum I use max(matrix)
For example:
The absolut maximum of this matrix is 6[3,6], but the relativ maximum is
6[3,6] and 4[7,6], because both values are the highest value in comparison
to their eight neighbours values.
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8]
[1,] 1 1 2 2 2
2008 Jul 23
2
Flip Matrix form file?
Hello,
I have a problem to flip a 200x200 matrix, which is imported by a .asc file.
I want to flip the matrix like in a created example below:
> b <- matrix(1:9,3,3,byrow=T)
> b
[,1] [,2] [,3]
[1,] 1 2 3
[2,] 4 5 6
[3,] 7 8 9
> b1 <- apply(t(b),1,rev)
> b1
[,1] [,2] [,3]
[1,] 7 8 9
[2,] 4 5 6
[3,] 1 2 3
but my
2001 Oct 02
1
RE: problem with while loop with next
Prof. Tierney,
Thanks very much for the info.
Why does the loop work if I move the assignment out of the condition? E.g.,
the following works:
i <- 0
while(i < 5) {
i <- i + 1
if(i < 3) next
print(i)
}
Regards,
Andy
> -----Original Message-----
> From: Luke Tierney [mailto:luke at nokomis.stat.umn.edu]
> Sent: Tuesday, October 02, 2001 3:36 PM
> To: Liaw, Andy
2001 Oct 02
1
problem with while loop with next (was RE: file connection, w hile, readLines and browser)
Dear R-help,
I think I have kinda isolated the problem I had to the following:
i <- 0
while( {i <- i + 1} < 5) {
if(i < 3) next
print(i)
}
This seems to go into an infinite loop. After I break the execution, i has
the value 1.
At the R prompt, if I start from i <- 0 and keep typing {i <- i + 1} < 5, it
eventually evaluate to TRUE. So why does the while loop not work?
2017 Jul 19
2
Creating/Reading a complex string in R
> On Jul 19, 2017, at 5:38 AM, Michael Friendly <friendly at yorku.ca> wrote:
>
> It was suggested to quote your string with *backticks* (` ... `) rather than single quotes.
>
> String <- `<html>
> <head>
> ...
> `
That failed for me. The parser considered it a language object, an R name. Here's what I needed to do:
> string <-
2011 Dec 31
2
read.csv error: invalid multibyte string
R version: 2.13.1
OS X
Colleagues,
I am working with a CSV file; for testing purposes, I created an XLS version of the file.
When I read these files using read.xls (gdata) or read.csv, I encounter an error:
Error in type.convert(data[[i]], as.is = as.is[i], dec = dec, na.strings = character(0L)) :
invalid multibyte string at '<b0>C'
The error occurs whether or not I invoke
2020 Jun 26
2
Error in substring: invalid multibyte string
Hi all,
I'm getting the following error from substring:
> substr("<I>Jens Oehlschl\xe4gel-Akiyoshi", 1, 100)
Error in substr("<I>Jens Oehlschl\xe4gel-Akiyoshi", 1, 100) :
invalid multibyte string at '<e4>gel-A<6b>iyoshi'
Is that normal / intended? I've tried setting the Encoding/locale to
Latin-1/UTF-8 but that does not help. nchar
2020 Jun 27
1
Error in substring: invalid multibyte string
Thanks for the quick response Ivan. readLines with encoding='latin1' works
for me (on Ubuntu).
However I was more concerned with the inconsistency in results between
substr and regexpr. I was expecting that if one of them errors because of
an unknown encoding then the other should as well. Even better, if regexpr
works, why shouldn't substr work as well?
Incidentally the analogous
2005 Sep 14
1
maximum string length in RdbiPgSQL and in R
Because my problem involves the RdbiPgSQL package, I sent a message
similar to this one to the Bioconductor list. But while awaiting
moderator approval of my message (because I am not a member of that
list), it occurred to me to send it to R-help as the problem may be more
general than just RdbiPgSQL.
Here's my situation:
I have been using RdbiPgSQL successfully for a year or two. I
2017 Jul 19
0
Creating/Reading a complex string in R
I think the whole premise of this question is flawed. If you want to work with this string as data, then read it in from a separate file using readLines. If it is fixed data that you want to be part of your program, then invest the effort to escape the odd characters and be done with it. But using backticks is a bad idea because they ate not just another kind of quote.
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2018 May 26
2
Buffering in R 3.5 connections causes incorrect data in readChar
I noticed an issue where readChar does not return the correct value after a
call to readline. It appears that readChar is not aware of the buffering,
so it reads from the end of the buffer, rather than the current position in
the file. This is a significant change of behavior from R-3.4.4.
Below is a test case that I used to home in on the problem.
---
p<-"test2.txt"
2010 Apr 28
2
How to read contents of a text file into a single string?
... Both readLines() and scan() produce a number_of_lines x 1 vector; trying
paste(s, collapse = NULL) leaves it unaffected. How can I concatenate vector
elements (lines) into a single string?
Thank you.
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