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Joshua Ulrich

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1638.69 (725th) 		Reputation
144,356 (398th)
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Title Δ
data frame (matrix) performance: memory layout -2.41
R Question: ifelse producing unexpected results +1.70
Way to use maxgap in na.locf for xts timeseries in R? 0.00
How do remove data from a certain weekday period from a R time-seri... 0.00
Drop Columns R Data frame +0.19
Problem with spline method = 'monoH.FC'' 0.00
R Newbie Confused about Install Packages +1.56
Drawing non-intersecting circles 0.00
command line arguments in bash to Rscript +0.15
Question about while loops in R 0.00
What is the most efficient way to cast a list as a data frame? +1.41
R -openAir, 96x31 time/date data into stacked data -1.66
Finding means and medians across data frames in r +0.60
Optimizing apply function output +1.59
Generating a very large matrix of string combinations using combn()... +0.99
Nested ifelse R function passed to sapply() to create new data.frame -1.49
R: getting chatty Java processes to STFU -0.96
Calculate Returns over Period of Time +0.40
detecting operating system in R (e.g. for adaptive .Rprofile files) +0.52
What is the best way to access the second to last value in an R dat... +0.08
R CMD INSTALL is stuck on a function that works... how can I debug... -0.19
General suggestions for debugging R? -0.26
Setting an xts Index -0.50
Is there any way to force zoo::rollmean function to return a vector... -0.73
How to insert a comma between each element in paste command in R? 0.00
How to install cran packages on Windows? +0.39
when do you want to set up new environments in R -1.04
How can I rewrite this code so that it uses plyr/ddply as intended? +0.18
how to calculate mean from part or a list/matrix/dataframe ? and wh... 0.00
optimizing a function to find global and local peaks with R +1.06
Choosing a Row based on matches and NA in a different field +2.21
Generating a Sequence of Characters in R +0.19
R: converting xts or zoo object to a data frame 0.00
how, in R, to plot time of day versus calendar date +0.42
Aggregate or summarize to get ratios -0.06
Paste logical conditions in R +0.42
R split column depending on values -1.32
how to do R includes -0.60
Testing cointegration of two stocks using Yahoo Finance data 0.00
Quickly apply xts vector operations across wide zoo objects in R 0.00
Plot with dates as X axis in R -0.59
Cartesian product data table in R -0.08
"abline" doesn't work after "plot" when inside... -0.07
Have R look for files in a library directory +0.43
Display time index in R xts 0.00
R sorts a vector on its own accord - bad boy! -1.18
Create empty dataframe in R with same columns 0.00
R, please Check my longest Drawdowns function -1.19
How to write a c() function for custom S3 class in R -0.27
Getting access to chart_Series () from the quantmod package 0.00