Mix.install([
{:jason, "~> 1.4"},
{:kino, "~> 0.9", override: true},
{:youtube, github: "brooklinjazz/youtube"},
{:hidden_cell, github: "brooklinjazz/hidden_cell"}
])
In this exercise, you're going to generate Pascal's Triangle for a certain number of rows.
In Pascal's Triangle, each number is the sum of the two integers above it.
flowchart
a[1]
b1[1]
b2[1]
c1[1]
c2[2]
c3[1]
d1[1]
d2[3]
d3[3]
d4[1]
e1[1]
e2[4]
e3[6]
e4[4]
e5[1]
a --> b1
a --> b2
b1 --> c1
b1 --> c2
b2 --> c2
b2 --> c3
c1 --> d1
c1 --> d2
c2 --> d2
c2 --> d3
c3 --> d3
c3 --> d4
d1 --> e1
d1 --> e2
d2 --> e2
d2 --> e3
d3 --> e3
d3 --> e4
d4 --> e4
d4 --> e5
We can also represent Pascal's triangle as a list of lists.
[[1], [1, 1], [1, 2, 1], [1, 3, 3, 1], [1, 4, 6, 4, 1]]
In the Elixir cell below, finish the of/1
function in the Pascal
module which will
return Pascal's triangle in a list for n
number of rows.
Pascal.of(1)
[
[1]
]
Pascal.of(2)
[
[1],
[1, 1],
]
Pascal.of(5)
[
[1],
[1, 1],
[1, 2, 1],
[1, 3, 3, 1],
[1, 4, 6, 4, 1]
]
defmodule Pascal do
@doc ~S"""
Generates a Pascal's Triangle of `n` rows.
## Examples
iex> Pascal.of(1)
[[1]]
iex> Pascal.of(5)
[[1], [1, 1], [1, 2, 1], [1, 3, 3, 1], [1, 4, 6, 4, 1]]
"""
def of(n) do
end
end
DockYard Academy now recommends you use the latest Release rather than forking or cloning our repository.
Run git status
to ensure there are no undesirable changes.
Then run the following in your command line from the curriculum
folder to commit your progress.
$ git add .
$ git commit -m "finish Pascal's Triangle exercise"
$ git push
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