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In Numerical Methods in Engineering with Python, 2nd Edition, Author: Jaan Kiusalaas, I wrote the same module found on page 146 that calculates the roots, f(x) = 0, using the bisection method:
from math import log,ceil
import error
def bisection2(f,x1,x2,switch=0,tol=1.0e-9):
`f1 = f(x1)`
`if f1 == 0.0: return x1`
`f2 = f(x2)`
`if f2 == 0.0: return x2`
`if f1*f2 > 0.0: error.err('Root is not bracketed')`
`n = ceil(log(abs(x2 - x1)/epsilon)/log(2.0))`
`for i in range(n):`
`x3 = 0.5*(x1 + x2); f3 = f(x3)`
`if (switch == 1) and (abs(f3) > abs(f1))
(abs(f3) > abs(f2)):`
`return None`
`if f3 == 0.0:return x3`
`if f2*f3 < 0.0:`
`x1 = x3; f1 = f3`
`else:`
`x2 = x3; f2 = f3`
`return (x1 + x2)/2.0`
I am encountering the following error:
ImportError Traceback (most recent call last)
/usr/lib/python2.7/dist-packages/IPython/utils/py3compat.pyc in execfile(fname, *where)
173 else:
174 filename = fname
--> 175 builtin.execfile(filename, *where)
/home/uwhpsc/Desktop/bisection2/bisection2.py in ()
1 from math import log,ceil
----> 2 import error
3
4 def bisection2(f,x1,x2,switch=0,tol=1.0e-9):
5 f1 = f(x1)
ImportError: No module named error
Kindly could anyone please advise me how to solve this issue? I really appreciate any help...
Many Thanks!
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لینک منبع
