Martin Morgan questions

Martin Morgan answers

• More efficient way to get a data matrix based on some value and index matrices in R?
• Assignment by vectorization (subsetting) in R
• Including a "Hash Table" in a package
• seq and seq_along, best of both worlds?
• Using sum in big dataframe (3.2GB) is very slow
• Why "$" autocompletion works for S4 class "SummarizedExperiment" from BioConductor
• iterate through FASTA entries and rename duplicates
• Mixing ... with formal args in s4 generic method
• R: Improving Nested ifelse Statements & Multiple Patterns
• Coverage by intersecting smaller genomic interval data over larger genomic intervals using R