Cath

Cath has asked 23 questions and find answers to 141 problems.

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I want to live in Theory, everything works there.

Cath questions

How to avoid `all` function returning `TRUE` when comparing to `NULL` or an empty object
fuse melt/dcast in one step
fill a data.table based on value in another data.table
Compute with data.table: how many 2x2 non NA values there are among the variables?
split character columns and get names of field in string
Unexpected behaviour of function table with "NaN" values
Reorder rows in data.table in a specific order

Cath answers

How to reverse rows in matrix? [duplicate]
How do I extract summary of PCA as a dataframe in R using Prcomp?
Sub-indexing a list to apply a function in R
Create a rolling index of pairs over groups
Nested rolling sum in vector
Using sum in big dataframe (3.2GB) is very slow
Plotting huge number of lines in R
Why 2 outputs of chisq.test are different in R
Extract first continuous sequence in vector
How to count the number of same elements which are in order in a vector in R?