On 2009-09-09 20:46 PM, rechard wrote:
Robert Kern wrote:
On 2009-09-08 20:45 PM, hi_roger wrote:
hello, i want to ask a question about numpy.
i know how to select a submatrix using the slice object in numpy. But
how can i select a submatrix
A[i1,i2,i3;j1,j2,j3] (elements in A on line i1,i2,i3 and column
j1,j2,j3 , and i1,i2,i3,j1,j2,j3 are all arbitrary numbers )
The submatrix must share data memory with original matrix.
Any one help? thank you
Sturla is almost correct. What you really want is this:
i = [[i1], [i2], [i3]]
j = [[j1, j2, j3]]
B = A[i, j]
http://docs.scipy.org/doc/numpy/reference/arrays.indexing.html#integer
If you have more numpy questions, please ask on the numpy mailing list.
http://www.scipy.org/Mailing_Lists
wow..., thank you all :)
but it seems it is impossible to make the submatrix share data with the
original matrix in pure numpy code ?
That is correct.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
--
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