R Numbers
A number holds a whole value or a decimal value. R can add, subtract, multiply and divide numbers.
Whole and decimal numbers
x holds a whole number and y holds a decimal number. The last print shows the sum of the two numbers.
x <- 42
y <- 3.5
print(x)
print(y)
print(x + y)Whole division and remainder
a holds the number 7. The prints show a plain division and then its whole part and remainder.
a <- 7
print(a / 2)
print(a %/% 2)
print(a %% 2)
print(-7 %/% 2)Powers and display
The first print raises 2 to the power 10. The next prints show 1000 in a short form and a division result with limited digits.
print(2 ^ 10)
print(1e3)
print(2 / 3)Example
price <- 20
count <- 4
print(price / count)
print(price * count)
print(1 / 0)
print(0 / 0)Key points
- A whole number is written with no decimal point.
- A decimal number is written with a decimal point.
- + adds numbers and - subtracts numbers.
- * multiplies numbers and / divides numbers.
- Division with / always gives a decimal result.
- %/% gives the whole part of a division and %% gives the remainder.
- ^ raises a number to a power.
In this example, price is divided by count and then multiplied by count. The last two prints show the special results Inf and NaN.
Note
R shows a number with up to 7 significant digits.
Try it Yourself
Edit the code, then press Run.
Running is simulated · rdrr.io R Snippets
Exercise
What does print(7 %% 2) show?