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import math # Need to import math to use the log function
from Tkinter import *
import ttk
import tkMessageBox
import tkFileDialog
import os
import sys
# Variables that should be noted
# G = Guess value
# count = f(x)
# den = f'(x)
# Acc = Accuracy input from user
def CheckVals():
# Define variables as floats - decimal places
r = 1
if r == 1:
try: #If any of the variables have errors catch
G = float(GuessInp.get())
A = float(AInp.get())
B = float(BInp.get())
Precision = int(AccInp.get())
r = 0
CalcRoot()
except ValueError:
tkinter.messagebox.showinfo("Look carefully","Oops, a variable isn't properly set")
r = 0
return
def CalcRoot():
# Start the while loop
G = float(GuessInp.get())
A = float(AInp.get())
B = float(BInp.get())
Precision = int(AccInp.get())
Acc = math.pow(0.1,Precision)
count = Acc+1 # Just so we can get into the while loop (count > Acc)
while count > Acc :
count = (G*(math.log(A*G)))
count = count - B
if count > Acc:
if count*A < 0: #Value not allowed
tkinter.messagebox.showinfo("Look carefully","Calculations will become unstable Pi * a <0")
return
## if ((math.pow(math.exp(1),-1)/A)*count): #This seems like one of the prerequisites not sure if there is a typing error on the tut
## tkinter.messagebox.showinfo("Look carefully","Calculations will become unstable Pi((e^-1)/a)")
## return
#Actual calculation
den =(math.log(A*G)) #This is the derivtive denominator
den = den + 1
numb = count/den
Temp = G - numb #Guess value minus the calculated numb
G = Temp
count = (G*(math.log(A*G)))
count = count - B
button1.pack_forget() #Hide Calculate button after success
GText = StringVar()
GText.set("Calculated Root: ")
label1 = Label(app, textvariable=GText, height = 4)
label1.pack()
Roottxt = StringVar(None)
Roottxt.set(G)
label7 = Label(app, textvariable=Roottxt)
label7.pack()
return
app = Tk()
app.title ("Newton Raphson approximation")
app.geometry('340x550+100+100')
CommText = StringVar()
CommText.set("Please complete the form and then click calculate")
label1 = Label(app, textvariable=CommText, height = 4)
label1.pack()
fxtxt = StringVar()
fxtxt.set("f(x) = (x * Ln(x * a)) - b\nf'(x) = 1 + Ln(ax)")
label2 = Label(app, textvariable=fxtxt, height = 4)
label2.pack()
#Input a
Atxt = StringVar()
Atxt.set("a = ")
label3 = Label(app, textvariable=Atxt, height = 2)
label3.pack()
A = StringVar(None)
AInp = Entry(app, textvariable=A)
AInp.pack()
#Input b
Btxt = StringVar()
Btxt.set("b = ")
label4 = Label(app, textvariable=Btxt, height = 2)
label4.pack()
B = StringVar(None)
BInp = Entry(app, textvariable=B)
BInp.pack()
#Input acc
DegText = StringVar()
DegText.set("To what accuracy do you want the root: ")
label5 = Label(app, textvariable=DegText, height = 4)
label5.pack()
Acc = StringVar(None)
AccInp = Entry(app, textvariable=Acc)
AccInp.pack()
#Input guess
Guesstxt = StringVar()
Guesstxt.set("What is your guess of the root")
label6 = Label(app, textvariable=Guesstxt, height = 4)
label6.pack()
G = StringVar(None)
GuessInp = Entry(app, textvariable=G)
GuessInp.pack()
#Calculation button
button1 = Button(app, text = "Calculate root", width = 20, command = CheckVals)
button1.pack(padx = 15,pady = 15)
app.mainloop()
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