# Positive or Negative in R

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Positive or Negative in R, we will learn how to use the sign function in R to determine whether a numeric value is positive or negative.

The sign function returns the signs of numeric elements, with a value of 1 for positive numbers, 0 for zero, and -1 for negative numbers.

**Basic R Syntax**

sign(5) # Basic R syntax of sign function

**Example: Return whether Number is Positive or Negative**

We can use the sign function to check whether a number is positive or negative.

For example, let’s create a vector of numbers from -2 to 5 and apply the sign function:

sign(-2:5) # Apply sign function # -1 -1 0 1 1 1 1 1

This returns the signs of the elements in the vector.

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The first two elements are negative (indicated by -1), the third element is zero (indicated by 0), and the remaining elements are positive (indicated by +1).

**Example: Checking Multiple Numbers**

We can also use the sign function to check multiple numbers at once.

For example, let’s create a vector of numbers and apply the sign function:

numbers <- c(-3, 0, 2, -5, 7) sign(numbers) # Apply sign function to multiple numbers # -1 0 1 -1 1

This returns the signs of the elements in the vector.

The first element is negative (indicated by -1), the second element is zero (indicated by 0), the third element is positive (indicated by +1), and the fourth element is negative (indicated by -1), and the fifth element is positive (indicated by +1).

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