Displaying 20 results from an estimated 2000 matches similar to: "Difficulties with dataframe filter using elements from an array created using a for loop or seq()"
2006 Jul 01
0
SUMMARY: making contour plots using (x,y,z) data
Folks,
A few days ago, I had asked a question on this mailing list about
making a contour plot where a function z(x,y) is evaluated on a grid
of (x,y) points, and the data structure at hand is a simple table of
(x,y,z) points. As usual, R has wonderful resources (and subtle
complexity) in doing this, and the gurus of the list showed me the
way. Here's a complete working example. One might
2006 Jun 25
1
Puzzled with contour()
Folks,
The contour() function wants x and y to be in increasing order. I have
a situation where I have a grid in x and y, and associated z values,
which looks like this:
x y z
[1,] 0.00 20 1.000
[2,] 0.00 30 1.000
[3,] 0.00 40 1.000
[4,] 0.00 50 1.000
[5,] 0.00 60 1.000
[6,] 0.00 70 1.000
[7,] 0.00 80 0.000
[8,] 0.00 90
2005 Nov 11
0
strange classification behaviour
You could use cut. The key calculation would be:
w <- .05; eps <- 1e-5
breakpoints <- seq(min(kk), max(kk), .05)
breakpoints <- floor( (breakpoints + (w/2) + eps) / w) * w
values <- cut(kk, c(breakpoints, Inf), right = FALSE)
values <- ordered(values)
If you don't like the labels produced add lab = breakpoints as a cut arg.
On 11/10/05, RenE J.V. Bertin
2009 Sep 16
3
apply function across two variables by mult factors
Greetings,
I am attempting to run a function, which produces a vector and
requires two input variables, across two nested factor levels. I can
do this using by(X, list(factor1, factor2), function), however I
haven't found a simple way to extract the list output into an
organized vector form. I can do this using nested loops but it isn't
exactly an optimal approach.
Thank you
2010 Sep 18
0
Saving long character variable to database saves timestamp instead
When saving a data frame with long character variable, approximately longer
than 30000 characters, to a text field in PostgreSQL, using RODBC on Windows
XP, I get a timestamp saved to the database instead. Is there any way to
extend the number of characters that a text variable can receive?
Here are the details of my case (simplified):
I'm using PostgreSQL to create a table
CREATE TABLE
2013 May 27
1
Question about subsetting S4 object in ROCR
Dear list
I'm testing a predictor and I produced nice performance plots with ROCR
package utilizing the 3 standard command
pred <- prediction(predictions, labels)
perf <- performance(pred, measure = "tpr", x.measure = "fpr")
plot(perf, col=rainbow(10))
The pred object and the perfo object are S4
with the following slots
An object of class "performance"
2013 May 15
1
x and y lengths differ
I have a problem with R. I try to compute the confidence interval for my
df. When I want to create the plot I have this problem: Error in
xy.coords(x, y, xlabel, ylabel, log) : 'x' and 'y' lengths differ.
I try this code:
library(dplR)
df.rwi <- detrend(rwl = df, method = "Spline",nyrs=NULL)
write.table(df.rwi,file="rwi.txt",quote=FALSE,row.names=TRUE)
2007 Nov 20
2
as.character(seq(-.35,.95,.1))
> as.character(seq(-.25,.95,.1))
[1] "-0.25" "-0.15" "-0.05" "0.05" "0.15" "0.25" "0.35" "0.45"
"0.55" "0.65" "0.75" "0.85" "0.95"
> as.character(seq(-.35,.95,.1))
[1] "-0.35" "-0.25"
2012 Nov 13
0
GAM model to reduce PACF of a model
I have asked this question on Stackoverflow and was told it does not relate
to the sites' mission as it is statistical question, thus I brought it here.
I am fitting a gam mode in the mgcv package to study associations of
environmental pollutants and mortality. The aim is to choose a model with
lowest mgcv and also to reduce the PACF to less than < |0.1|.
library(gamair)
library(mgcv)
2009 Mar 20
4
how to make aggregation in R ?
Hi,
I am trying to aggregate the sum of my test data.frame as follow:
testDF <- data.frame(v1 = c("a", "a", "a", "a", "a", "b", "b", "b", "b",
"b", "c", "c", "c", "c", "c", "d", "d", "d", "d",
2011 Mar 09
2
SQLDF - Submitting Queries with R Objects as Columns
Fellow R programmers,
I'd like to submit SQLDF statements with R objects as column names.
For example, I want to assign "X" to "var1" (var1<-"X") and then refer to
"var1" in the SQLDF statement. SQLDF needs to understand that when I
reference "var1", it should look for "X" in the dataframe.
This is necessary because my SQLDF
2009 Jul 21
1
problem with heatmap.2 in package gplots generating non-finite breaks
I have written a wrapper for heatmap.2 called
heatmap.w.row.and.col.clust which auto-generates breaks using
breaks<-round((c(seq(from=(-20 * stddev), to=(20 * stddev))))/20,
digits = 2) #(stddev in this case = 2.5)
This has always worked well in the past but now I am getting an error
that non-finite breaks are being generated. Drilling down, it seems
that my wrapper is generating finite
2008 Feb 26
1
wrapper for save function
Hello -
I would like to create a wrapper to the 'save' function in the base
package, but have a small problem with the name of the object that is
getting saved in the file. Below is a simple example illustrating my
problem.
## BEGIN SAMPLE R CODE
##################################################
## Here is the wrapper for the save function
2011 Sep 12
2
Automated generation of combinations
Hello,
I'd like to generate automatically all the possible combinations of a set of 8 variables (there are 535, too many to do it by hand). For example:
input: varA, varB, varC
output: varA+varB+varC
varA+varB
varA+varC
varB+varC
varA
varB
varC
Is there any function that produces this option?
Thank you
[[alternative
2008 Mar 16
2
How to loop through all the columns in dataframe
Hi:
Can anyone advice me on how to loop and perform a
calculation through all the columns.
here's my data
xd<-
c(2.2024,2.4216,1.4672,1.4817,1.4957,1.4431,1.5676)
pd<-
c(0.017046,0.018504,0.012157,0.012253,0.012348,0.011997,0.012825)
td<- c(160524,163565,143973,111956,89677,95269,81558)
mydf<-data.frame(xd,pd,td)
trans<-t(mydf)
trans
I have these values that I need to
2011 Aug 03
1
Coefficient names when using lm() with contrasts
Dear R Users,
Am using lm() with contrasts as below. If I skip the contrasts()
statement, I get the coefficient names to be
> names(results$coef)
[1] "(Intercept)" "VarAcat" "VarArat" "VarB"
which are much more meaningful than ones based on integers.
Can anyone tell me how to get R to keep the coefficient names based on the
factor levels
2005 Dec 13
1
Manipulating matrices
Hi,
I'm pretty new to R and I've been having some problems filtering data
in matrices.
I have the following initial dataset:
|| year | name | varA ||
I have multiple values for "varA" for the same "year" and the same "name".
Having this as the input I would like to obtain the following:
|| year | name | {varA mean} ||
Where I only have one line for each
2011 Jan 01
3
Retrieving Factors with Levels Ordered
Hello (and Happy New Year),
When I create a factor with labels in the order I want, write the data as a text file, and then retrieve them, the factor levels are no longer in the proper order.
Here is what I do (I tried many variations):
# educ is a numeric vector with 1,001 observations.
# There is one NA
# Use educ to create a factor
feducord <- factor(educ, labels = c('Elem',
2018 Apr 28
2
mp3 stream and Chrome v.65.0.33.25.181
Hi there,
I have used VLC 0.9.9 on Windows platform for streaming audio to icecast2 for years. Had no problems. Since Google Chrome v.65.0.33.25.181 I ran into problems. Stream will play couple of minutes and then stop.
Is there something fundamentally wrong with my configuration in vlm configuration:
output
2007 Nov 07
2
creating a dynamic output vector
Let's say I have a program that returns variables whose names may be any
string within the vector
NAMES=c("varA","varB","varC","varD","varE","varF"..."varZ"), but I do
not ever know which ones have actually been created. So in one example
output, "varA", "varC", and "varD" could exist, but