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Remove .md and image files and move python files into main chapter folders

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lolabird 2023-11-19 20:53:50 -07:00
commit 67806dab6a
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thinkcspy/Chapter-11-Exercises/Python-files/Problem4.py
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# Runestone.Academy thinkcspy course
# Chapter 11
# Problem 4
import turtle
def slope():
xlist = []
ylist = []
sumx = 0
sumy = 0
sumxy = 0
sumxsq = 0
count = 0 #n
meanx = 0
meany = 0
slope = 0 #m
with open('labdata.txt') as lab:
for line in lab:
values = line.split()
xlist += [int(values[0])]
ylist += [int(values[1])]
x = int(values[0])
y = int(values[1])
sumx += x
sumy += y
sumxy += x*y
sumxsq += x**2
count += 1
meanx = sumx / count
meany = sumy / count
slope = (sumxy - count*meanx*meany) / (sumxsq - count*meanx**2)
plotRegression(xlist, ylist, meanx, meany, slope)
def plotRegression(xlist, ylist, meanx, meany, slope):
#set world coordinates
minx = xlist[0]
miny = ylist[0]
maxx = xlist[0]
maxy = ylist[0]
count = len(xlist)
num = 0
while num < count:
if xlist[num] < minx:
minx = xlist[num]
if xlist[num] > maxx:
maxx = xlist[num]
if ylist[num] < miny:
miny = ylist[num]
if ylist[num] > maxy:
maxy = ylist[num]
num += 1
turtle.setworldcoordinates(minx-10, miny-10, maxx+10, maxy+10)
#plot points
i = 0
wn = turtle.Screen()
wn.bgcolor("#222")
ella = turtle.Turtle() #points from the labdata.txt
ella.color("pink")
maya = turtle.Turtle() #line of best fit (yplot)
maya.color("lightblue")
for x in xlist:
j = 0
yplot = meany + slope*(x - meanx)
while not j:
ella.up()
ella.goto(x, ylist[i])
ella.dot()
if i != 0:
maya.goto(x, yplot)
else:
maya.up()
maya.goto(x, yplot)
maya.down()
j += 1
i += 1
wn.exitonclick()
slope()