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Beginners Problem

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Join Date: Jul 2008

Posts: 1,046

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Solved Threads: 264

jlm699

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Knows where his Towel is

Re: Beginners Problem

#11

Dec 17th, 2008

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Originally Posted by mikewalsh89

ok this is what i have;
from math import *

x=input("What value will you give x?:")
n=input("Please set a maximium amount of iterations?:")
for i in range (n):
x = x - ((x-cos(x))/(1 + sin(x)))
break
y =x
if (y-x) <= 10**-8:
print y
elif (y-x) > 10**-8:
continue

still not working..advice??

Please use code tags when posting code in this forum. To use code tags wrap your code in these guys:
[code=python]
# Code in here
[/code]

Just to be nice I'll wrap your code for you:

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
from math import *
 
x=input("What value will you give x?:")
n=input("Please set a maximium amount of iterations?:")
for i in range (n):
    x = x - ((x-cos(x))/(1 + sin(x)))
    break
    y =x
    if (y-x) <= 10**-8:
        print y
    elif (y-x) > 10**-8:
        continue
from math import *

x=input("What value will you give x?:")
n=input("Please set a maximium amount of iterations?:")
for i in range (n):
    x = x - ((x-cos(x))/(1 + sin(x)))
    break
    y =x
    if (y-x) <= 10**-8:
        print y
    elif (y-x) > 10**-8:
        continue

See how much nicer that looks? And indentation is not lost!

So first thing: remove the break and the continue statements.
Next, y = x should be assigned at the end of your loop.

That should get you a little closer

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Join Date: Oct 2004

Posts: 18

Reputation: Nuez_Jr is an unknown quantity at this point

Solved Threads: 1

Nuez_Jr

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Newbie Poster

Re: Beginners Problem

#12

Jan 6th, 2009

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
x = initial_value
x_last = x
 
threshold = minimum_change
MAXITER = maximum_iterations_desired
iterations = 0
 
while iterations < MAXITER and x - x_last > threshold:
    x_last = x
    x = iterate(x)
 
# x now holds your result
x = initial_value
x_last = x

threshold = minimum_change
MAXITER = maximum_iterations_desired
iterations = 0

while iterations < MAXITER and x - x_last > threshold:
    x_last = x
    x = iterate(x)

# x now holds your result