nofunsally questions

• Use unique rows from data.frame to subset another data.frame
• Extracting p-value from lapply list of glm fits
• Arrange ggplot plots (grobs with same widths) using gtable to create 2x2 layout
• Create index from group to select value from original data.frame to use in result
• Split list every n elements and cbind, then rbind slices
• Remove group from data.frame if at least one group member meets condition
• Label minimum and maximum of scale fill gradient legend with text: ggplot2

nofunsally answers