4 Workflow:basics
library("tidyverse")4.1 Coding basics
R can be used as a calculator.
4.1.1 Exercise
No exercise.
4.2 What’s in the name
i_am_snake_case
IAmCamelCase
i.am.period.case
i_am.MixCase
4.2.1 Exercise
No exercise.
4.3 Calling functions
Call functions using the syntax below:
function_name(arg1 = value1, arg2 = value2)
4.3.1 Exercise
No exercise.
4.4 Practice
4.4.1 Exercise
Q1. Why does the code does not work?
my_variable <- 10
my_varıable
## Error in eval(expr, envir, enclos): object 'my_varıable' not foundAns1. The code does not work because the variable which is assigned the value 10 is my_variable whereas the variable being called is different. The R will throw an error if it cannot find the variable in the environment.
Q2. Tweak each of the following R commands so that they run correctly:
ggplot(data = mpg) +
geom_point(mapping = aes(x = displ, y = hwy))
fliter(mpg, cyl = 8)
## Error in fliter(mpg, cyl = 8): could not find function "fliter"
filter(diamond, carat > 3)
## Error in filter(diamond, carat > 3): object 'diamond' not foundAns2. There are typos in the above code. Although, the first part of the code is correct.
ggplot(data = mpg) +
geom_point(mapping = aes(x = displ, y = hwy))
fliter should be filter and = should be ==
filter(mpg, cyl == 8)## # A tibble: 70 x 11
## manufacturer model displ year cyl trans drv cty hwy fl
## <chr> <chr> <dbl> <int> <int> <chr> <chr> <int> <int> <chr>
## 1 audi a6 quatt… 4.20 2008 8 auto(… 4 16 23 p
## 2 chevrolet c1500 su… 5.30 2008 8 auto(… r 14 20 r
## 3 chevrolet c1500 su… 5.30 2008 8 auto(… r 11 15 e
## 4 chevrolet c1500 su… 5.30 2008 8 auto(… r 14 20 r
## 5 chevrolet c1500 su… 5.70 1999 8 auto(… r 13 17 r
## 6 chevrolet c1500 su… 6.00 2008 8 auto(… r 12 17 r
## 7 chevrolet corvette 5.70 1999 8 manua… r 16 26 p
## 8 chevrolet corvette 5.70 1999 8 auto(… r 15 23 p
## 9 chevrolet corvette 6.20 2008 8 manua… r 16 26 p
## 10 chevrolet corvette 6.20 2008 8 auto(… r 15 25 p
## # ... with 60 more rows, and 1 more variable: class <chr>diamond should be diamonds
filter(diamonds, carat > 3)## # A tibble: 32 x 10
## carat cut color clarity depth table price x y z
## <dbl> <ord> <ord> <ord> <dbl> <dbl> <int> <dbl> <dbl> <dbl>
## 1 3.01 Premium I I1 62.7 58.0 8040 9.10 8.97 5.67
## 2 3.11 Fair J I1 65.9 57.0 9823 9.15 9.02 5.98
## 3 3.01 Premium F I1 62.2 56.0 9925 9.24 9.13 5.73
## 4 3.05 Premium E I1 60.9 58.0 10453 9.26 9.25 5.66
## 5 3.02 Fair I I1 65.2 56.0 10577 9.11 9.02 5.91
## 6 3.01 Fair H I1 56.1 62.0 10761 9.54 9.38 5.31
## 7 3.65 Fair H I1 67.1 53.0 11668 9.53 9.48 6.38
## 8 3.24 Premium H I1 62.1 58.0 12300 9.44 9.40 5.85
## 9 3.22 Ideal I I1 62.6 55.0 12545 9.49 9.42 5.92
## 10 3.50 Ideal H I1 62.8 57.0 12587 9.65 9.59 6.03
## # ... with 22 more rowsQ3. Press Alt + Shift + K. What happens? How can you get to the same place using the menus?
Ans3. It gives the keyboard shortcuts menu. The same can be achieved under Tools -> Keyboard shortcuts or Help -> Keyboard shortcuts.