Practice: Calculator

1 + 100

> 1 +

3 + 5 * 2

(3 + 5) * 2

(3 + (5 * (2 ^ 2))) # hard to read
  3 + 5 * 2 ^ 2       # clear, if you remember the rules
  3 + 5 * (2 ^ 2)     # if you forget some rules, this might help

2/10000

5e3  # Note the lack of minus here

getwd() #returns an absolute filepath

sin(1)  # trigonometry functions

log(1)  # natural logarithm

log10(10) # base-10 logarithm

exp(0.5) # e^(1/2)

1 == 1  # equality (note two equals signs, read as "is equal to")

1 != 2  # inequality (read as "is not equal to")

1 < 2  # less than

1 <= 1  # less than or equal to

1 > 0  # greater than

1 >= -9 # greater than or equal to

x <- 1/40

x

log(x)

x <- 100

x <- x + 1 #notice how RStudio updates its description of x on the top right tab
 y <- x * 2

x = 1/40

R
min_height max.height _age .mass MaxLength min-length 2widths celsius2kelvin

R
min_height max.height MaxLength celsius2kelvin

R
.mass

R
_age min-length 2widths

R
1:5

R
2^(1:5)

R
x <- 1:5 2^x

R
ls()

R
ls

R
x

R
rm(x)

R
rm(list = ls())

R
rm(list <- ls())

---

Source: The Carpentries, https://swcarpentry.github.io/r-novice-gapminder/01-rstudio-intro/index.html
This work is licensed under a Creative Commons Attribution 4.0 License.