getChicagoData

# 1. set WD
setwd("C:/Users/Core-i5/Desktop/dataSci/3 Getting data/W3") # NOTE: change this PATH

# 2. make folder
if(!file.exists("./data")){
    dir.create("./data")
}

# 3. make handle
fileURL <- "https://github.com/DataScienceSpecialization/courses/blob/master/03_GettingData/dplyr/chicago.rds?raw=true"

# 4. download data
download.file(fileURL, destfile = "./data/chicago.rds", method = "curl", extra='-L')

# 5. read data
chicago <- readRDS("./data/chicago.rds")

Thanks ,duxan
Yes,when using the
http://stackoverflow.com/questions/29814405/why-do-i-need-to-use-mode-wb-with-download-file-for-this-rds-file
it gives the right data ,and we can manipulate the Data with dplyr nicely and smoothly