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Matthew Lundberg

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1566.78 (4,478th) 		Reputation
36,309 (3,118th)
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Title Δ
merge two rows of n dimension by considering one column -0.24
Data Manipulation in R Project: compare rows 0.00
Observations of Student-t Distribution with Degrees of Freedom - R 0.00
The attached object won't change when I modify it? 0.00
Combining data frames with unequal number of columns -0.05
How to replace the white spaces and character with specified charac... +1.84
Generating Random Dates +0.40
Finding the GCD without looping - R +1.20
What is the difference between na.omit and is.na? +0.44
R: append a "character" type to a list of numeric values -1.08
convert rows after column +1.71
Select top ten levels of a factor based on another variable -1.63
Rcpp code crashes R -1.45
Adding a non-aggregated column to an aggregated data set based on t... -0.27
rollapply with a function taking a matrix returns "incorrect n... +2.40
why factor() does not take out the levels of a factor that have no... 0.00
What is the R equivalent of delete in SAS +0.16
Reading data in R from a single column text file +1.07
lm function throws an error in terms.formula() in R 0.00
Extract rows from data frame based on multiple identifiers in anoth... 0.00
data.frame colmn mean at n-th interval of rows 0.00
Grouping data in R with including those attributes that are not on... +0.39
Error handling in R: tryCatch() syntax 0.00
Removing one space that was created in R +0.45
How to tabulate counts of 2 factor-class vectors into big dataframe? 0.00
if statemtent with error I never seen -0.44
Sort data frame column by factor +0.43
Lookup table for new column in dataframe in R +0.96
Boxplot of two vectors of different types 0.00
How to use 'sapply' or 'lapply' to count the number of lines in n c... -2.08
Extracting and sorting Data from a list- find the highest value 0.00
Data Subsetting: Lists within list in R 0.00
selecting rows of which the value of the variable is equal to certa... -0.07
Get named variable from list of list 0.00
how to merge stock data from two different sets? +1.47
conditional statement in r +1.93
Updating Variable using functions in data.table? 0.00
Calculate between columns in data.table or dplyr? +1.55
Mapping identifiers transitively 0.00
How to remove certain rows from a list in R? 0.00
Aggregate to compute the percentage of non-zero rows per group 0.00
Looping through rows and recording matching pairs 0.00
R apply function on symmetrical matrix 0.00
Determining Whether a Matrix Has At Least One Zero Element +0.39
replacement has length zero in nested loop -1.13
Pairwise calculation in r -0.99
Calculate means of specific columns -0.13
Different results inside and outside of a user-defined function,why? 0.00
R: combining matrices by column name 0.00
Replacing header in data frame based on values in second data frame +0.11