I have a very strange situation with matplotlib plotting in
sage-4.0.rc0. The worksheet below illustrates the problem.
If the worksheet is restarted, and "Evaluate All" is selected, the
last cell produces an error (see traceback at the end). But, if that
input cell is evaluated again, the error clears, and the plot is
produced. Everything will be fine until the worksheet is restarted,
when a new evaluation will once again produce the error.
Baffled.
====================
Plot Strangeness 3
system:sage
{{{id=0|
import matplotlib.pyplot as pyplot
import numpy as NP
///
}}}
{{{id=89|
Vs=NP.array([165.8, 166.3, 161.2, 162.6, 158.9], dtype=float)
Ps=NP.array([141.4, 144.3, 134.7, 136.4, 127.6], dtype=float)
X=Vs^4
Y=Vs * Ps
///
}}}
{{{id=33|
var('a, b')
data=zip(X, Y)
model(x) = a + b * x
linear_fit = find_fit(data, model, solution_dict = True)
///
}}}
{{{id=19|
A=linear_fit[a]
B=linear_fit[b]
fit(x)= A + B * x
Xfit=[0,800000000]
Yfit=[float(fit(0)), float(fit(800000000))]
P2=pyplot.plot(Xfit, Yfit, 'b')
pyplot.savefig('test.png')
///
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/kwh/.sage/sage_notebook/worksheets/KevinHorton/27/code/
47.py", line 13, in <module>
Yfit=[float(fit(_sage_const_0 )),
float(fit(_sage_const_800000000 ))]
File "expression.pyx", line 2785, in
sage.symbolic.expression.Expression.__call__ (sage/symbolic/
expression.cpp:14209)
File "/opt/sage-4.0.rc0/local/lib/python2.5/site-packages/sage/
symbolic/callable.py", line 448, in _call_element_
return SR(_the_element.substitute(**d))
File "parent.pyx", line 284, in
sage.structure.parent.Parent.__call__ (sage/structure/parent.c:4084)
File "parent.pyx", line 1087, in
sage.structure.parent.Parent.convert_map_from (sage/structure/parent.c:
9912)
File "parent.pyx", line 1094, in
sage.structure.parent.Parent.discover_convert_map_from (sage/structure/
parent.c:10062)
File "parent.pyx", line 958, in
sage.structure.parent.Parent.coerce_map_from (sage/structure/parent.c:
8791)
File "parent.pyx", line 1007, in
sage.structure.parent.Parent.discover_coerce_map_from (sage/structure/
parent.c:9139)
File "ring.pyx", line 138, in
sage.symbolic.ring.SymbolicRing._coerce_map_from_ (sage/symbolic/
ring.cpp:3254)
File "parent.pyx", line 883, in
sage.structure.parent.Parent.has_coerce_map_from (sage/structure/
parent.c:8344)
File "parent.pyx", line 905, in
sage.structure.parent.Parent.has_coerce_map_from (sage/structure/
parent.c:8307)
File "parent.pyx", line 958, in
sage.structure.parent.Parent.coerce_map_from (sage/structure/parent.c:
8791)
File "parent.pyx", line 1007, in
sage.structure.parent.Parent.discover_coerce_map_from (sage/structure/
parent.c:9139)
File "parent_old.pyx", line 579, in
sage.structure.parent_old.Parent._coerce_map_from_ (sage/structure/
parent_old.c:7269)
File "/opt/sage-4.0.rc0/local/lib/python2.5/site-packages/sage/
rings/complex_field.py", line 310, in _coerce_map_from_
if RR.has_coerce_map_from(S):
File "parent.pyx", line 883, in
sage.structure.parent.Parent.has_coerce_map_from (sage/structure/
parent.c:8344)
File "parent.pyx", line 905, in
sage.structure.parent.Parent.has_coerce_map_from (sage/structure/
parent.c:8307)
File "parent.pyx", line 958, in
sage.structure.parent.Parent.coerce_map_from (sage/structure/parent.c:
8791)
File "parent.pyx", line 1007, in
sage.structure.parent.Parent.discover_coerce_map_from (sage/structure/
parent.c:9139)
File "real_mpfr.pyx", line 458, in
sage.rings.real_mpfr.RealField._coerce_map_from_ (sage/rings/
real_mpfr.c:5688)
File "parent.pyx", line 879, in
sage.structure.parent.Parent._coerce_map_via (sage/structure/parent.c:
8117)
File "parent.pyx", line 958, in
sage.structure.parent.Parent.coerce_map_from (sage/structure/parent.c:
8791)
File "parent.pyx", line 1007, in
sage.structure.parent.Parent.discover_coerce_map_from (sage/structure/
parent.c:9139)
File "real_lazy.pyx", line 111, in
sage.rings.real_lazy.LazyField._coerce_map_from_ (sage/rings/
real_lazy.c:2992)
File "parent.pyx", line 883, in
sage.structure.parent.Parent.has_coerce_map_from (sage/structure/
parent.c:8344)
File "parent.pyx", line 905, in
sage.structure.parent.Parent.has_coerce_map_from (sage/structure/
parent.c:8307)
File "parent.pyx", line 958, in
sage.structure.parent.Parent.coerce_map_from (sage/structure/parent.c:
8791)
File "parent.pyx", line 1007, in
sage.structure.parent.Parent.discover_coerce_map_from (sage/structure/
parent.c:9139)
File "parent_old.pyx", line 581, in
sage.structure.parent_old.Parent._coerce_map_from_ (sage/structure/
parent_old.c:7298)
File "parent_old.pyx", line 130, in
sage.structure.parent_old.Parent.coerce_map_from_c (sage/structure/
parent_old.c:1732)
File "parent_old.pyx", line 179, in
sage.structure.parent_old.Parent.coerce_map_from_c_impl (sage/
structure/parent_old.c:2443)
File "parent_old.pyx", line 431, in
sage.structure.parent_old.Parent.has_coerce_map_from_c (sage/structure/
parent_old.c:5825)
File "parent_old.pyx", line 444, in
sage.structure.parent_old.Parent.has_coerce_map_from_c_impl (sage/
structure/parent_old.c:6038)
File "parent.pyx", line 1346, in
sage.structure.parent.Parent.an_element (sage/structure/parent.c:12879)
File "parent_old.pyx", line 591, in
sage.structure.parent_old.Parent._an_element_ (sage/structure/
parent_old.c:7583)
File "ring.pyx", line 370, in
sage.symbolic.ring.SymbolicRing._an_element_ (sage/symbolic/ring.cpp:
4820)
File "parent.pyx", line 284, in
sage.structure.parent.Parent.__call__ (sage/structure/parent.c:4084)
File "parent.pyx", line 1087, in
sage.structure.parent.Parent.convert_map_from (sage/structure/parent.c:
9912)
File "parent.pyx", line 1094, in
sage.structure.parent.Parent.discover_convert_map_from (sage/structure/
parent.c:10062)
File "parent.pyx", line 958, in
sage.structure.parent.Parent.coerce_map_from (sage/structure/parent.c:
8791)
File "parent.pyx", line 1007, in
sage.structure.parent.Parent.discover_coerce_map_from (sage/structure/
parent.c:9139)
File "ring.pyx", line 88, in
sage.symbolic.ring.SymbolicRing._coerce_map_from_ (sage/symbolic/
ring.cpp:2727)
File "/opt/sage-4.0.rc0/local/lib/python2.5/site-packages/sage/
symbolic/callable.py", line 307, in _coerce_map_from_
return SymbolicRing._coerce_map_from_(self, R)
File "ring.pyx", line 88, in
sage.symbolic.ring.SymbolicRing._coerce_map_from_ (sage/symbolic/
ring.cpp:3582)
File "ring.pyx", line 118, in
sage.symbolic.ring.SymbolicRing._coerce_map_from_ (sage/symbolic/
ring.cpp:2863)
AttributeError: 'module' object has no attribute 'float128'
}}}
--
Kevin Horton
Ottawa, Canada
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