Create list in while loop in python

Question

Hi all,

I've made a programme to calculate and plot the vertical and horizontal distance of a projectile when fired at an initial entered velocity at an angle.

The code produces a correct plot but I can't seem to print the maximum vertical distance.

I use a while loop that breaks when the distance gets to zero.

Is it best to create a list and add on new distance values each time?

Thanks!

Answer 1

If you hate to create list then do something like

max_vertical_distance = 0

when you are calculating the distances in a loop then put this line of code to find the max vertical distance:

max_vertical distance = max(max_vertical_distance, current_vertical_distance)

Answer 2

Thanks, this is my code:

import matplotlib.pyplot as plt
import math
print("This programme finds the maximum distance that a projectile travels when fired from ground level at an initial velocity.")
print("")
print("Air resistance is negligible")

u= float(input("Please enter the initial velocity: "))
#print(u)

a = -9.81

xv=0.0
xh=0.0

t=1.0

ang= float(input("Please enter the angle of fire, between 0 and 90 degrees: "))

rad=((math.pi)/(180))*(ang)

uh=(u)*(math.cos(rad))

uv=(u)*(math.sin(rad))

print(rad, uh, uv)

while range (xv>=0):

list=[]

xv = ((uv)*(t))+((0.5)*(a)*(t)*(t))

xh = (uh)*(t)

vv=uv+(a*t)
vh=uh

t=t+1

xv = max(xv)

plt.plot(xh,xv)
plt.scatter(xh, xv)

if xv<=0:
break

print(list)

print("")
print("The maximum height is", max(xv) , "m, with a flight time of", t, "s")
print("")
print("The velocity when the projectile lands is",vv,"m/s" )

# naming the x axis
plt.xlabel('Horizontal distance (m)')
# naming the y axis
plt.ylabel('Vertical distance (m)')
plt.show()

Answer 3

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