시험문제

from pylab import *

for i in arange(0.0,2*pi,0.2):

 t = arange(0.0, 2*pi,0.01)

 x= cos(t)+cos(i)

 y= sin(t)+sin(i)

 plot(x,y)

show()

from pylab import *

for i in arange(0.0,2*pi,0.01):

 t= arange(0.0,2*pi,0.1)

 x=cos(t)+cos(i)

 y=sin(t)+sin(i)

plot(x,y) # 들여쓰기 잘못도 치명적 오류

show()

from pylab import *

i = arange(0.0,2*pi,0.1)

for j in arange(0.0,2*pi,0.1):

  x= 0.1*cos(i)+cos(j)

  y= 0.1*sin(i)+sin(j)

  plot(x,y)

show()

# encoding:utf-8

from pylab import *

f = open("C:/logs.txt","r")

lines = f.readlines()

f.close()

aList = map(lambda a:a.split(),lines)

del aList[0]

nameList = map(lambda a:a[8],aList)

plot(map(lambda name:nameList.count(name),set(nameList)))

show()

from pylab import *

t = arange(0.0, 5.0, 0.02)

a = np.exp(-t)+np.exp(-4*t)

plot(t, a,"r^")

b = np.exp(-t)*cos(sqrt(3)*t)+np.exp(-4*t)*sin(sqrt(3)*t)

plot(t, b,"bo")

c = cos(2*t)+sin(2*t)

plot(t, c,"b")

d = np.exp(-2*t)+t*np.exp(-2*t)

plot(t, d,"g+")

title('About as simple as it gets, folks')

grid(True)

show()

from pylab import *

t = arange(0.0, 20.0, 0.02)

s = 2*(sin(t)/1 - sin(2*t)/2 + sin(3*t)/3 - sin(4*t)/4+sin(5*t)/5)

plot(t, s, linewidth=1.0)

title('About as simple as it gets, folks')

grid(True)

show()

from pylab import *

t = arange(0.0, pi, 0.02)

plot(t,sin(6*t),"g")

plot(t,cos(6*t),"y")

s = sin(6*t)+cos(6*t)

plot(t, s, "r")

k = sin(6*t)*cos(6*t)

plot(t, k, "b")

title('sin, cos add & sin, cos mult')

grid(True)

show()

from pylab import *

a=[[0,0],[3,5],[3,8]]

b=[[1,1],[3,6],[5,8]]

print(map(lambda x,y:sqrt((x[1]-y[1])**2+(x[0]-y[0])**2),a,b))

import numpy as np

import matplotlib.pyplot as plt

t = np.arange(0., 10, 0.1)

i = 1+1j

print abs(i)

# log x and y axis

plt.loglog(t, abs(1j*t/((1j*t*1j*t)+1j*t+1.0)))

plt.grid(True)

plt.show()

from pylab import *

import numpy as np

import matplotlib.pyplot as plt

t = arange(0.0, 0.05, 0.0001)

i = 100/(1+1j*4)

print angle(i)

It = imag(i*np.exp(1j*120*np.pi*t))

plot(t,It, "r")

plot(t,imag(100*np.exp(1j*120*np.pi*t)),"b")

show()