## Blog Pages

import numpy as np
# We will add,multiply, subtract  the vector v to each row of the matrix x,
x = np.array([[1,2,3], [4,5,6], [7,8,9]])
v = np.array([1, 0, 1])
print(x)
print(v)
y = x + v
y1= x * v
y2= x - v

### Drawing a H-Tree Fractal using turtle in python program

import turtle
SPEED = 8
BG_COLOR = "red"
PEN_COLOR = "lightgreen"
SCREEN_WIDTH = 600
SCREEN_HEIGHT = 600
DRAWING_WIDTH = 500
DRAWING_HEIGHT = 500
PEN_WIDTH = 5
TITLE = "H-Tree Fractal"
FRACTAL_DEPTH = 3
def draw_line(tur, pos1, pos2):
tur.penup()
tur.goto(pos1[0], pos1[1])
tur.pendown()
tur.goto(pos2[0], pos2[1])

def recursive_draw(tur, x, y, width, height, count):
draw_line(
tur,
[x + width * 0.25, height // 2 + y],
[x + width * 0.75, height // 2 + y],
)
draw_line(
tur,
[x + width * 0.25, (height * 0.5) // 2 + y],
[x + width * 0.25, (height * 1.5) // 2 + y],
)
draw_line(
tur,
[x + width * 0.75, (height * 0.5) // 2 + y],
[x + width * 0.75, (height * 1.5) // 2 + y],
)
if count <= 0:
return
else:
count -= 1

recursive_draw(tur, x, y, width // 2, height // 2, count)
recursive_draw(tur, x + width // 2, y, width // 2, height // 2, count)
recursive_draw(tur, x, y + width // 2, width // 2, height // 2, count)
recursive_draw(tur, x + width // 2, y + width // 2, width // 2, height // 2, count)

if __name__ == "__main__":
# Screen setup
screen = turtle.Screen()
screen.setup(SCREEN_WIDTH, SCREEN_HEIGHT)
screen.title(TITLE)
screen.bgcolor(BG_COLOR)
# Turtle artist (pen) setup
artist = turtle.Turtle()
artist.hideturtle()
artist.pensize(PEN_WIDTH)
artist.color(PEN_COLOR)
artist.speed(SPEED)

recursive_draw(artist, - DRAWING_WIDTH / 2, - DRAWING_HEIGHT / 2, DRAWING_WIDTH, DRAWING_HEIGHT, FRACTAL_DEPTH)

turtle.done()

### Drawing a fractal tree using turtle in python program

import turtle
MINIMUM_BRANCH_LENGTH = 15
def build_tree(t, branch_length, shorten_by, angle):
if branch_length > MINIMUM_BRANCH_LENGTH:
t.forward(branch_length)
new_length = branch_length - shorten_by
t.left(angle)
build_tree(t, new_length, shorten_by, angle)
t.right(angle * 2)
build_tree(t, new_length, shorten_by, angle)
t.left(angle)
t.backward(branch_length)
tree = turtle.Turtle()
tree.hideturtle()