Status: Accepted
Owner: [email protected]
Labels: Type-Enhancement Priority-Medium Matrices
New issue 2221 by [email protected]: hstack() and vstack() methods for
Matrix
http://code.google.com/p/sympy/issues/detail?id=2221
After the fix for issue 2212, Matrix(...) is able to stack its arguments
vertically. This raises interesting additional points:
* it should be possible to stack things horizontally as well
* this feels like too much complexity for a constructor
So, I think that Matrix should get 2 more constructors (i.e. classmethods
returning instances of Matrix): Matrix.hstack and Matrix.vstack. These can
be implemented quite simply for now:
@classmethod
def vstack(cls, *args):
return Matrix(args)
@classmethod
def hstack(cls, *args):
transpose = lambda arg: arg.transpose() if isinstance(arg, Matrix) else
arg
return Matrix(map(transpose, args)).transpose()
but ultimately, the actual logic for the operations should be transferred
from Matrix.__init__. The new class methods will also deprecate .col_join()
and .row_join().
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