Marta Karas questions

• Design pattern to guarantee only one Runnable object of particular id value is being executed by the pool
• Why the 'Measured negative execution time!' error appears? (And how to deal with it?)
• Sort list of lists in R: sort one lists' value depending on other lists' value
• Hadoop Pseudo-Distributed Operation error: Protocol message tag had invalid wire type
• What is the purpose difference between README and vignette in R package?
• Plot geom_segment on ggmap object in R - lines not appearing
• R get objects' names from the list of objects
• geom_ribbon doesn't work - Error in eval(expr, envir, enclos) : object 'variable' not found
• Extract part of string between two different patterns
• Plot complex numbers in R with ggplot2

Marta Karas answers