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1004.py
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1004.py
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# 공부를 위해서 최대한 라이브러리를 사용하지 않고 해 보기 위해서
# 일부러 numpy 사용하지 않음
#
# 전체적으로는 딱히 참고한 코드 없음
# 부분적으로는 웹상의 수많은 코드들을 참고 하였으나 붙여넣기 한 것은 없음
#
# python 3.5 환경에서 작성 하였음
#
# 실험용으로 대충 빨리 만들어본 코드라서 깔끔하지 않음
#
# 게다가 python 사용한지 2주일 정도 밖에 안 되어서,
# python을 잘 알고 보면 이상한 코드가 많을 것으로 추정됨
#
# Color Palette from Color Schemer Online v2
# http://www.colorschemer.com/online.html
#
# 작성자:
# Facebook: https://facebook.com/dgtgrade
# Youtube: https://youtube.com/channel/UCEdT99nAs8nalv6Mafs9RiA
# email: dgtgrade@gmail.com
import matplotlib.pyplot as plt
import math
H = [] # 키
W = [] # 몸무게
with open("data/2_mchc.tsv") as f:
for line in f:
[i, height, weight] = line.split("\t")
height = 2.54 * float(height)
weight = 0.453592 * float(weight)
#print ("%.2f" % height, "%.2f" % weight)
H.append(height)
W.append(weight)
m = len(H) # len(W)도 동일
BoxLeft = min(H)
BoxRight = max(H)
BoxBottom = min(W)
BoxTop = max(W)
BoxWidth = BoxRight-BoxLeft
BoxHeight = BoxTop-BoxBottom
f, ax = plt.subplots(figsize=(160,90))
plt.subplots_adjust(left=0.0, right=1.0, top=1.0, bottom=0.0)
# LBox = Larger Box
LBoxLeft = BoxLeft-BoxWidth*0.2
LBoxRight = BoxRight+BoxWidth*0.2
LBoxTop = BoxTop+BoxHeight*0.2
LBoxBottom = BoxBottom-BoxHeight*0.2
ax.set(xlim=(LBoxLeft,LBoxRight),
ylim=(LBoxBottom,LBoxTop))
ax.set_axis_bgcolor("#000000")
ax.xaxis.set_visible(False)
ax.yaxis.set_visible(False)
for i in range(m):
ax.plot(H[i],W[i],linestyle="None",marker="o",markersize=15,color="#33CCFF")
plt.pause(0.01)
ax.axhline(y=BoxBottom, linewidth=5, linestyle="--", color="#33CCFF")
plt.pause(0.5)
ax.axvline(x=BoxRight, linewidth=5, linestyle="--", color="#33CCFF")
plt.pause(0.5)
ax.axhline(y=BoxTop, linewidth=5, linestyle="--", color="#33CCFF")
plt.pause(0.5)
ax.axvline(x=BoxLeft, linewidth=5, linestyle="--", color="#33CCFF")
plt.pause(0.5)
plt.show(block=False)
BHStep = (BoxRight - BoxLeft) / 16
BVStep = (BoxTop - BoxBottom) / 16
GunPosX = []
GunPosY = []
# float 지원하는 range
# 기본 range와 달리 step 이 맞는 경우 end도 포함됨
def frange(start,end,step):
assert ((start<end and step>0)
or (start>end and step<0)
or (start==end and step==0))
r = []
x = start
while (x >= min(start,end) and x <= max(start,end)):
r.append(x)
x += step
return r
# Bottom
r = frange(BoxLeft,BoxRight,BHStep)
GunPosX.extend(r)
GunPosY.extend([BoxBottom]*len(r))
# Right
r = frange(BoxBottom,BoxTop,BVStep)
GunPosX.extend([BoxRight]*len(r))
GunPosY.extend(r)
# Top
r = frange(BoxRight,BoxLeft,-BHStep)
GunPosX.extend(r)
GunPosY.extend([BoxTop]*len(r))
# Left
r = frange(BoxTop,BoxBottom,-BVStep)
GunPosX.extend([BoxLeft]*len(r))
GunPosY.extend(r)
#plt.plot(GunPosX, GunPosY,
# linestyle="None",marker="D",markersize=20,color="red")
#plt.show(block=False)
# 선 y=ax+b과 큰 박스의 네변이 교차 하는 점들을 반환
def cross (a,b):
crX = []
crY = []
# Left
x = LBoxLeft
y = a * x + b
if (LBoxBottom <= y and y <= LBoxTop) :
crX.append(x)
crY.append(y)
# Right
x = LBoxRight
y = a * x + b
if (LBoxBottom <= y and y <= LBoxTop) :
crX.append(x)
crY.append(y)
# Top
if (a!=0):
y = LBoxTop
x = (y-b)/a # y = ax + b => x = (y - b)/a
if (LBoxLeft <= x and x <= LBoxRight) :
crX.append(x)
crY.append(y)
# Bottom
y = LBoxBottom
x = (y-b)/a # y = ax + b => x = (y - b)/a
if (LBoxLeft <= x and x <= LBoxRight) :
crX.append(x)
crY.append(y)
else:
# 기울기가 0이면 y=b 선으로, 박스 왼쪽선, 오른쪽선을 지난다.
crX.append(LBoxLeft)
crY.append(b)
crX.append(LBoxRight)
crY.append(b)
return (crX, crY)
ERRMAX = 999.99
def error(a,b):
err = 0.0
for i in range(m):
x = H[i]
y = W[i]
h = a*x + b
err += abs(h-y)
err = min(err / m, ERRMAX)
return err
ThetaStep = 6
numGuns = len(GunPosX)
err_min_all = ERRMAX # 전체 포대에서의 최소 에러
best_line_all = None
for i in range(numGuns):
gunX = GunPosX[i]
gunY = GunPosY[i]
err_min = ERRMAX # 이번 포대에서의 최소 에러
err = err_min
best_line = None
for theta in range(-90,90,ThetaStep):
a = math.tan(math.radians(theta))
b = gunY - a * gunX #y=ax+b => b=y-ax
crX, crY = cross(a,b)
err_prev = err
err = error(a,b)
best = False
best_all = False
if (err < err_min):
best = True
err_min = err
if (err < err_min_all):
best_all = True
err_min_all = err
if (err < err_prev):
err_arrow = "(-)"
err_color = "green"
elif (err > err_prev):
err_arrow = "(+)"
err_color = "red"
else:
err_arrow = ""
err_color = "black"
# txt = ax.text(0.5,0.9,"MAE :"+"%6.2f" % err+" "+err_arrow,
# family="monospace", fontsize=30, color=err_color,
# ha='center', transform=ax.transAxes)
gundot, = ax.plot(gunX, gunY,
marker="*",markersize="40",color="#FFCC33",alpha=1.0)
line, = ax.plot(crX, crY,
linestyle="--", linewidth="10",
marker="None",markersize="30",color="#FFCC33",alpha=0.8)
plt.show(block=False)
plt.pause(0.01)
gundot.remove()
line.remove()
# txt.remove()
if (best):
if (best_line != None):
best_line.remove()
best_line, = ax.plot(crX, crY,
linestyle="--", linewidth="10",
marker="None",color="#FF6633",alpha=0.8)
if (best_all):
if (best_line_all != None):
best_line_all.remove()
best_line_all, = ax.plot(crX, crY,
linestyle="-", linewidth="15",
marker="None",color="#FF3366",alpha=0.8)
if (best_line != None):
best_line.remove()
plt.pause(1)
plt.show(block=True)