G. Grothendieck questions

G. Grothendieck answers

• apply a function to a nested list
• Create a panel data frame
• Subsetting lists via logical index vectors
• Carry Last Observation Forward by ID in R
• Read columns of a csv file using shell or pipe inside R - Windows
• How to return monthly minimum values for each year that are least 10 days apart
• Elegant way to optionally supply an argument to a function in R?
• How to create a time series plot in the style of a horizontal stacked bar plot in r
• Reading text into data.frame where string values contain spaces
• Why is this xts frequency always 1?