Dear Pythoneers,
sorry for bothering. I want to draw several curves in one graph, but the
amount of curves is not a fixed number.
My homework is below:
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import matplotlib.pyplot as plt
import math
if __name__=='__main__':
try:
n=int(input('how many curves? '))
ulist=[]
thetalist=[]
for i in range(n):
ulist.append(float(input('Enter velocity: ')))
thetalist.append(float(input('Enter angle: ')))
except ValueError:
print('invalid input')
else:
* generateFr(?????) # here I want to draw several curves with
ulist[0], thetalist[0], ulist[1], thetalist[1]... ... ulist[n-1],
thetalist[n-1]*
def generateFr(u, theta):
theta=math.radians(theta)
g=9.8
tflight=2*u*math.sin(theta)/g
intervals=frange(0, tflight, 0.001)
x=[]
y=[]
for t in intervals:
x.append(u*math.cos(theta)*t)
y.append(u*math.sin(theta)*t - 0.5*g*t*t)
drawgraph(x, y)
def frange(start, final, increment):
numbers=[]
while start<final:
numbers.append(start)
start+=increment
return numbers
def drawgraph(x, y):
plt.plot(x, y)
plt.xlabel('x-coordinate')
plt.ylabel('y-coordinate')
plt.title('Projectile motion')
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Thank you very much. I hope I describe my question clearly.
Tom
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