ulp() function of Python math module

Overview:

For a given floating point number, the function ulp(num) returns the distance between the number and the next floating point number. This is applicable to signed floating point numbers as well.
As the magnitude of a floating point number increases the precision with which it can be represented decreases. The ulp also differs as the value range of the floating point number changes.

Example:

# Example Python program that prints the
# unit in the last place for a given
# real number
import math

# A big magnitude in floating point representation
num = 100000000000000000.0
ulp = math.ulp(num)
print("Number:%f"%num)
print("ulp:%f"%ulp)
print("Next floating point number:%f"%(num+ulp))

Output:

Number:100000000000000000.000000

ulp:16.000000

Next floating point number:100000000000000016.000000

Ulp() function of Python math module

Overview:

Example:

Output: