[Numpy-discussion] How do I make a diagonal matrix? (original) (raw)
Travis Oliphant oliphant at ee.byu.edu
Fri Jun 23 13:11:38 EDT 2006
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Alan G Isaac wrote:
On Fri, 23 Jun 2006, Keith Goodman apparently wrote:
my x is a Nx1 matrix. I can't get it to work with matrices.
Hmm. One would think that diag() would accept a flatiter object, but it does not. Shouldn't it??
It doesn't?
try:
a = rand(3,4) diag(a.flat).shape
which prints (12,12) for me.
Also:
a = ones((2,3))
diag(a.flat) array([[1, 0, 0, 0, 0, 0], [0, 1, 0, 0, 0, 0], [0, 0, 1, 0, 0, 0], [0, 0, 0, 1, 0, 0], [0, 0, 0, 0, 1, 0], [0, 0, 0, 0, 0, 1]])
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