user971102 questions

• ggplot2 order categorical stacked bars by proportions of y-axis
• How to compute p-values from z-scores in R when the Z score is large (pvalue much below zero)?
• Print a count of unique values for each column in many files
• Merge two data frames in R and find common values and non-matching values
• Combine multiple .RData files containing objects with the same name into one single .RData file
• Arrange many plots using gridExtra
• R fill values depending on combination
• Collapse intersecting regions
• grep using a character vector with multiple patterns

user971102 answers