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How can I override the __call__ method of a matrix

I'd like to override the __call__ method of a matrix so that M(v) returns M*v. That is, I'd like to use functional notation. So I tried the following:

class MyMatrix(Matrix):
    def __call__(self, v):
        return self*v

but this doesn't work because Matrix is a MatrixFactory, so is a metaclass, not a class.

How can I override the __call__ method of a matrix

I'd like to override the __call__ method of a matrix so that M(v) returns M*v. That is, I'd like to use functional notation. So I tried the following:

class MyMatrix(Matrix):
    def __call__(self, v):
        return self*v

but this doesn't work because Matrix is a MatrixFactory, so is a metaclass, not a class.class. I get the following error when I try the above code in sage:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-88-e8d789594dd8> in <module>()
----> 1 class MyMatrix(Matrix):
      2             def __call__(self, v):
      3                     return self*v
      4 

TypeError: Error when calling the metaclass bases
    object() takes no parameters

How can I override the __call__ method of a matrix

I'd like to override the __call__ method of a matrix so that M(v) returns M*v. That is, I'd like to use functional notation. So I tried the following:

class MyMatrix(Matrix):
    def __call__(self, v):
        return self*v

but this doesn't work because Matrix work. Here is a MatrixFactory, so is a metaclass, not a class. the error message I get the following error when I try the above code in sage:

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-88-e8d789594dd8> in <module>()
----> 1 class MyMatrix(Matrix):
      2             def __call__(self, v):
      3                     return self*v
      4 

TypeError: Error when calling the metaclass bases
    object() takes no parameters

I don't know anything about metaclasses. After banging my head against various walls, trying to learn, I am asking here.