Matlab vs Python (was RE: Discussion: Introducing new operators for matrix computation)

[Paul Prescod]

Huaiyu Zhu wrote:
> 
> ...
> 
> That's a good point.  Can __getattr__ be made to work only on a selected
> number of attributes?  We could use it on T, H, I, C for transpose,
> Hermitian transpose, inverse and conjugate.  But if it works on all the
> undefind members the error message may be too obscure.  

I don't think you need __getattr__

class Matrix:
	def __init__( self, ....):
		self.T=Transpose( self )
		self.H=Hermitian( self )
		self.I=Inverse( self )
		self.C=Conjugate( self )
		self.E=Elementwise( self )
		self.M=self # matrixwise is default
	... other matrix-like methods ...

class Transpose:
	def __init__( self, mymatrix ):
		self.mymatrix=mymatrix
	... other matrix-like methods, but transposed ...

Notice that no computation (e.g. actual transposition) needs to be done
until you actually need to calculate a value. Maybe you can find
optimizations that allow only tiny parts of matrices to be computed.
-- 
 Paul Prescod - Not encumbered by corporate consensus
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