View Source Multitool.Numbers.Triangular (multitool v0.3.4)
Provides operations for working with triangular numbers
A triangular number is generated by adding the natural numbers up to
and including the number n.
The 4th triangular number, for example, can be calculated as follows:
1 + 2 + 3 + 4 = 10
Link to this section Summary
Functions
Returns the nth triangle number where the first triangle number is one.
Returns a list of the first n triangle numbers, starting at one
Link to this section Functions
Returns the nth triangle number where the first triangle number is one.
If n is less than one, zero is returned
parameters
Parameters
n: The nth triangle number to retrieve
examples
Examples
iex> nth_triangle_num(3)
6
iex> nth_triangle_num(-1)
0
iex> nth_triangle_num(34)
595Returns a list of the first n triangle numbers, starting at one
If n is less than one, an empty list is returned
parameters
Parameters
n: The number of triangle numbers to retrieve
examples
Examples
iex> triangle_nums(3)
[1, 3, 6]
iex> triangle_nums(-1)
[]
iex> triangle_nums(5)
[1, 3, 6, 10, 15]