# fixed point iteration issue [closed]

Im having a problem with this code wonder if someone could help me, its a code for fixed point iteration:

def valores(f,p,a,b,xi,n):
var('k,xk,fi,ErAbs,ErRel,ErMet')
a==a
b==b
xi==xi
x1=p(xi)
L=[[k,xk,fi,ErAbs,ErRel,ErMet]]
for i in range (0,n):
L.append([n,xi,x1,er,ea,em])
er = abs(x1-xi)
if xi > 1:
ea = er/xi
else:
ea = er
em = ea*(l*(1-l))
xi=p(xi)
x1 = p(xi)
return (matrix(L))


@interact
def Exp(n = selector(range(0, 11),nrows=1, label="Botão"),f = input_box(default=x*e^x-1), a = input_box(default=0.5), b = input_box(default=1), xi = input_box(default=0.8),p = input_box(default=e^(-x)):
df = diff(f,x)
dp = diff(p,x)
if df(x) > 0:
l = abs(dp(b))
else:
l = abs(dp(a))
show(valores(f,p,a,b,xi,n))


Error showed:

Traceback (most recent call last): File "<stdin>", line 1, in <module> File "_sage_input_117.py", line 10, in <module> exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8 -*-\\n" + _support_.preparse_worksheet_cell(base64.b64decode("QGludGVyYWN0CmRlZiBF\ eHAobiA9IHNlbGVjdG9yKHJhbmdlKDAsIDExKSxucm93cz0xLCBsYWJlbD0iQm90w6NvIiks\ ZiA9IGlucHV0X2JveChkZWZhdWx0PXgqZV54LTEpLCBhID0gaW5wdXRfYm94KGRlZmF1bHQ9\ MC41KSwgYiA9IGlucHV0X2JveChkZWZhdWx0PTEpLCB4aSA9IGlucHV0X2JveChkZWZhdWx0\ PTAuOCkscCA9IGlucHV0X2JveChkZWZhdWx0PWVeKC14KSk6CiAgICBkZiA9IGRpZmYoZix4\ KQogICAgCiAgICBkcCA9IGRpZmYocCx4KQogICAgCiAgICBpZiBkZih4KSA+IDA6CiAgICAg\ ICAgbCA9IGFicyhkcChiKSkKICAgIGVsc2U6CiAgICAgICAgbCA9IGFicyhkcChhKSkKICAg\ ICAgICAKICAgIHNob3codmFsb3JlcyhmLHAsYSxiLHhpLG4pKQ=="),globals())+"\\n")\ ; execfile(os.path.abspath("___code___.py"))' + '\n', '', 'single') File "", line 1, in <module> File "/tmp/tmpWfUq28/___code___.py", line 4 def Exp(n = selector(range(_sage_const_0 , _sage_const_11 ),nrows=_sage_const_1 , label="Botão"),f = input_box(default=x*e**x-_sage_const_1 ), a = input_box(default=_sage_const_0p5 ), b = input_box(default=_sage_const_1 ), xi = input_box(default=_sage_const_0p8 ),p = input_box(default=e**(-x)): ^ SyntaxError: invalid syntax

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### Closed for the following reason the question is answered, right answer was accepted by roriiz close date 2016-06-01 10:31:58.036851

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One closing parenthesis is missing at the end of the line defining your interact Exp:

It should be (three closing parentheses):

def Exp(n = selector(range(0, 11),nrows=1, label="Botão"),f = input_box(default=x*e^x-1), a = input_box(default=0.5), b = input_box(default=1), xi = input_box(default=0.8),p = input_box(default=e^(-x))):

more

that was actually a error but still getting a error when i chose n = 1 on the button it shows this error:

Traceback (most recent call last): File "<stdin>", line 1, in <module> File "_sage_input_127.py", line 10, in <module> exec compile(u'open("___code___.py","w").write("# -- coding: utf-8 --\n" + _support_.preparse_worksheet_cell(base64.b64decode("X2ludGVyYWN0Xy51cGRh\ dGUoJzMnLCAnbicsIDEsIF9pbnRlcmFjdF8uc3RhbmRhcmRfYjY0ZGVjb2RlKCdNUT09Jyks\ IGdsb2JhbHMoKSkKX2ludGVyYWN0Xy5yZWNvbXB1dGUoJzMnKQ=="),globals())+"\n")\ ; execfile(os.path.abspath("___code___.py"))' + '\n', '', 'single') File "", line 1, in <module>

File "/tmp/tmp50pxgy/___code___.py", line 4, in <module> exec compile(u"_interact_.recompute('3')" + '\n', '', 'single') File "", line 1, in <module>

( 2016-06-01 10:15:01 -0500 )edit

and on other values for n too if i choose n = 0 shows only this

(k xk fi ErAbs ErRel ErMet)

( 2016-06-01 10:18:03 -0500 )edit