Collection of R programming commands (update: 6/21/2020)
R-programming
Variable – anything
that can change, it could be qualitative (color, fruit) or quantitative
(height, weight)
-
Dependence and independence
-
Dose not have to use quote “”
-
Case sensitive – the alphabet has to be exact
match
Vector
-
Simplest type of data structure
-
Sequence of data elements
-
Member of a vector – components
-
For example; c(1, 2, 3) – this is called vector
-
1, 2, 3 are components?
-
Example
o
length (c("aa", "bb",
"cc", "dd", "ee")) – I think this is factors –
type of vector that used for categorization
§
Length is variable
§
Aa, bb, cc are elements
o
c(TRUE, FALSE, TRUE, FALSE, FALSE) – logical
value
o
c(2, 3, 5) -- number
Combining vectors
-
c() – for concatenate
-
fruits <- c("Apple",
"oranges", "banana")
-
vegetables <- c("cabbage",
"spinach", "tomatoes")
-
fruits <- c("Apple",
"oranges", "banana")
Ref:
##for commenting the command
Hit tab -- > to get automated command
View() -- > to view data
Library
-
collection of command tools
-
After loading library -- > click tab to see
the command in the library
-
Rcurl -- > using
for retrieving data from html/ftp
-
Skimr --
> provide more parameter on statistic
-
Caret
-- > using for plotting predictive model
Clear screen
-
ctr+L
$ after the data -- > show the variable in data
Number in front of the row -- > the order
Run command
- ctrl+enter
To visualize the simple statistic summary
Cross mark - > real-time check, the command is wrong
infographic <- read.csv(text =
getURL("https://raw.githubusercontent.com/tlerksuthirat/sample-dataset/master/json_infographics_csv"),
header = TRUE)
View(variable) -- > show the data table in Rscript
View(infographic)
View("C:/Users/tassanee.l/Desktop/infographic.xlsx")
read_xlsx("C:/Users/tassanee.l/Desktop/infographic.xlsx")
The data will be in the console.
Code relates to this note: https://github.com/tlerksuthirat/R-learning/blob/master/Learning%20basic%20command.R
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