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mGalarnyk/R_Programming.R

Last active December 31, 2016 17:55
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R programming Coursera John Hopkins Week 1 Review Suggestion Showing data.table functionality https://medium.com/@GalarnykMichael/in-progress-review-course-2-r-programming-jhu-coursera-ad27086d8438#.vclier2hw
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R_Programming.R
# Reading in data
quiz_data <- fread('hw1_data.csv')
# Column names of the dataset
names(quiz_data)
# First two rows
quiz_data[c(1,2)]
# Number of rows in data.table
nrows(quiz_data)
# Extracting the last 2 rows of the data.table (either expression would work)
tail(quiz_data,2)
quiz_data[c(.N-1,.N)]
# Removing Missing Values
quiz_data[complete.cases(quiz_data),]
# Ozone values are above 31 and Temp values are above 90. etc
quiz_data[Ozone > 31 & Temp > 90]
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