[Numpy-discussion] How do I make a diagonal matrix?
Alan G Isaac
aisaac at american.edu
Fri Jun 23 17:00:29 EDT 2006
> Alan G Isaac wrote:
>> Why is a.flat not the same as a.A.flat?
On Fri, 23 Jun 2006, Travis Oliphant apparently wrote:
> It is the same object except for the pointer to the
> underlying array. When asarray(a.flat) get's called it
> looks to the underlying array to get the sub-class and
> constructs that sub-class (and matrices can never be 1-d).
> Thus, it's a "feature"
I doubt I will prove the only one to stumble over this.
I can roughly understand why a.ravel() returns a matrix;
but is there a good reason to forbid truly flattening the matrix?
My instincts are that a flatiter object should not have this
hidden "feature": flatiter objects should produce
a consistent behavior in all settings, regardless of the
underlying array. Anything else will prove too surprising.
fwiw,
Alan
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