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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