KevinJohnson

01-28-2012, 10:46 AM

I'm trying to create a Fibonacci number generator script that can resume from a previously stopped generation session. And i seem to be getting an error on the console.

I'm new to python so, please be gentle ^__^

btw... once i have all of the bugs worked out of this basic script, i plan to integrate Parallel Python into this, so that really big Fibonacci numbers can be generated (up into the n = 1,000,000 or greater) in a reasonable amount of time.

On a single thread, with an i7 (only using a single core) 720QM (1.6 Ghz) i seem to be able to generate 100,000 Fibonacci numbers within 2 days. That's a bit long to wait i think.

Another area i plan to go with this is also integrating PyOpenCL, or PyCuda into my code base, so that speed can be further accelerated via GPU

Here's the error i'm getting on the console

Calculated 0golden numbers

Calculated 1golden numbers

Calculated 2golden numbers

Traceback (most recent call last):

File "C:\Users\kevin\Desktop\fib.py", line 74, in <module>

fib(i)

File "C:\Users\kevin\Desktop\fib.py", line 35, in fib

terms[2] = line

IndexError: list assignment index out of range

here is my full code

import sys

import os.path

def fib(n):

# Check to see if Phi.dat exists

if os.path.exists('Phi.dat'):

# Read the Phi.dat file and read the last 2 Golden Numbers

#

terms = [0,1]

# Count the number of lines in the Phi.dat file

Phifile = open("Phi.dat")

linecount = 0

while 1:

line = Phifile.readline()

if not line:

break

pass # do something

linecount = linecount + 1

MaxLines = linecount

Phifile.close()

# Set the last two Fibionacci numbers in Phi.dat to terms[0] and terms[1]

Phifile = open("Phi.dat")

linecount = 0

while 1:

line = Phifile.readline()

if not line:

break

pass # do something

linecount = linecount + 1

if linecount == MaxLines -1:

terms[1] = line

if linecount == MaxLines:

terms[2] = line

Phifile.close()

# Continue generating Fibonacci numbers until the specified limit has been reached

# Open the Phi.dat file in append mode

file = open('Phi.dat', 'a')

i = 2

while i <= n:

nth = str(terms[i-1] + terms[i-2])

terms.append(nth)

i = i + 1

file.write(nth)

file.close()

else:

# The file doesn't exist, so start generating Fibbonacci numbers from zero to the specified limit

# If the file does not exist, set terms[0] = 0 and terms[1] = 1

terms = [0,1]

# Open Phi.dat in the current directory in append mode

file = open('Phi.dat', 'a')

i = 2

while i <= n:

nth = str(terms[i-1] + terms[i-2])

terms.append(nth)

i = i + 1

file.write(nth)

file.close()

# Get the upper limit of Fibbonacci number to calculate

limit = int(sys.argv[1])

# Let's makes sure that we didn't already generate the Fibonacci number specified on the command line

for i in range(limit):

fib(i)

print "Calculated " + str(i) + "golden numbers"

I'm new to python so, please be gentle ^__^

btw... once i have all of the bugs worked out of this basic script, i plan to integrate Parallel Python into this, so that really big Fibonacci numbers can be generated (up into the n = 1,000,000 or greater) in a reasonable amount of time.

On a single thread, with an i7 (only using a single core) 720QM (1.6 Ghz) i seem to be able to generate 100,000 Fibonacci numbers within 2 days. That's a bit long to wait i think.

Another area i plan to go with this is also integrating PyOpenCL, or PyCuda into my code base, so that speed can be further accelerated via GPU

Here's the error i'm getting on the console

Calculated 0golden numbers

Calculated 1golden numbers

Calculated 2golden numbers

Traceback (most recent call last):

File "C:\Users\kevin\Desktop\fib.py", line 74, in <module>

fib(i)

File "C:\Users\kevin\Desktop\fib.py", line 35, in fib

terms[2] = line

IndexError: list assignment index out of range

here is my full code

import sys

import os.path

def fib(n):

# Check to see if Phi.dat exists

if os.path.exists('Phi.dat'):

# Read the Phi.dat file and read the last 2 Golden Numbers

#

terms = [0,1]

# Count the number of lines in the Phi.dat file

Phifile = open("Phi.dat")

linecount = 0

while 1:

line = Phifile.readline()

if not line:

break

pass # do something

linecount = linecount + 1

MaxLines = linecount

Phifile.close()

# Set the last two Fibionacci numbers in Phi.dat to terms[0] and terms[1]

Phifile = open("Phi.dat")

linecount = 0

while 1:

line = Phifile.readline()

if not line:

break

pass # do something

linecount = linecount + 1

if linecount == MaxLines -1:

terms[1] = line

if linecount == MaxLines:

terms[2] = line

Phifile.close()

# Continue generating Fibonacci numbers until the specified limit has been reached

# Open the Phi.dat file in append mode

file = open('Phi.dat', 'a')

i = 2

while i <= n:

nth = str(terms[i-1] + terms[i-2])

terms.append(nth)

i = i + 1

file.write(nth)

file.close()

else:

# The file doesn't exist, so start generating Fibbonacci numbers from zero to the specified limit

# If the file does not exist, set terms[0] = 0 and terms[1] = 1

terms = [0,1]

# Open Phi.dat in the current directory in append mode

file = open('Phi.dat', 'a')

i = 2

while i <= n:

nth = str(terms[i-1] + terms[i-2])

terms.append(nth)

i = i + 1

file.write(nth)

file.close()

# Get the upper limit of Fibbonacci number to calculate

limit = int(sys.argv[1])

# Let's makes sure that we didn't already generate the Fibonacci number specified on the command line

for i in range(limit):

fib(i)

print "Calculated " + str(i) + "golden numbers"