https://wiki.sagemath.org/interact/linear_algebra
@interact
def linear_transformation(A=matrix([[1,-1],[-1,1/2]]),theta=slider(0, 2*pi,
.1), r=slider(0.1, 2, .1, default=1)):
v=vector([r*cos(theta), r*sin(theta)])
w = A*v
circles = sum([circle((0,0), radius=i, color='black') for i in [1..2]])
pretty_print(html("$%s %s=%s$"%tuple(map(latex, [A, v.column().n(4),
w.column().n(4)]))))
show(v.plot(color='red')+w.plot(color='blue')+circles,aspect_ratio=1)
I got this error in sagemath 8.1(beta4)
Any help ?
Traceback (most recent call
last)/home/pi/sage/local/lib/python2.7/site-packages/ipywidgets/widgets/interaction.pyc
in update(self, *args) 215 value =
widget.get_interact_value() 216
self.kwargs[widget._kwarg] = value--> 217 self.result =
self.f(**self.kwargs) 218 if self.auto_display and
self.result is not None: 219 display(self.result)
<ipython-input-3-082d256f4933> in linear_transformation(A, theta, r) 4
w = A*v 5 circles = sum([circle((Integer(0),Integer(0)), radius=i,
color='black') for i in (ellipsis_range(Integer(1),Ellipsis,Integer(2)))])---->
6 pretty_print(html("$%s %s=%s$"%tuple(map(latex, [A,
v.column().n(Integer(4)), w.column().n(Integer(4))])))) 7
show(v.plot(color='red')+w.plot(color='blue')+circles,aspect_ratio=Integer(1))
/home/pi/sage/src/sage/structure/element.pyx in
sage.structure.element.Element.__getattr__
(/home/pi/sage/src/build/cythonized/sage/structure/element.c:4286)() 477
AttributeError: 'LeftZeroSemigroup_with_category.element_class' object
has no attribute 'blah_blah' 478 """--> 479 return
self.getattr_from_category(name) 480 481 cdef
getattr_from_category(self, name):
/home/pi/sage/src/sage/structure/element.pyx in
sage.structure.element.Element.getattr_from_category
(/home/pi/sage/src/build/cythonized/sage/structure/element.c:4395)() 490
else: 491 cls = P._abstract_element_class--> 492
return getattr_from_other_class(self, cls, name) 493 494 def
__dir__(self):
/home/pi/sage/src/sage/cpython/getattr.pyx in
sage.cpython.getattr.getattr_from_other_class
(/home/pi/sage/src/build/cythonized/sage/cpython/getattr.c:1822)() 252
dummy_error_message.cls = type(self) 253 dummy_error_message.name
= name--> 254 raise dummy_attribute_error 255 attribute =
<object>attr 256 # Check for a descriptor (__get__ in Python)
AttributeError: 'sage.rings.real_mpfr.RealNumber' object has no attribute
'column'
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