[Numpy-discussion] How to concatenate two arrays without duplicating memory?

2009-09-02 Thread V. Armando Solé
Hello, Let's say we have two arrays A and B of shapes (1, 2000) and (1, 4000). If I do C=numpy.concatenate((A, B), axis=1), I get a new array of dimension (1, 6000) with duplication of memory. I am looking for a way to have a non contiguous array C in which the left (1, 2000)

Re: [Numpy-discussion] How to concatenate two arrays without duplicating memory?

2009-09-02 Thread Gael Varoquaux
On Wed, Sep 02, 2009 at 09:40:49AM +0200, V. Armando Solé wrote: Let's say we have two arrays A and B of shapes (1, 2000) and (1, 4000). If I do C=numpy.concatenate((A, B), axis=1), I get a new array of dimension (1, 6000) with duplication of memory. I am looking for a way to

Re: [Numpy-discussion] How to concatenate two arrays without duplicating memory?

2009-09-02 Thread V. Armando Solé
Gael Varoquaux wrote: You cannot in the numpy memory model. The numpy memory model defines an array as something that has regular strides to jump from an element to the next one. I expected problems in the suggested case (concatenating columns) but I did not expect the problem would be so

Re: [Numpy-discussion] How to concatenate two arrays without duplicating memory?

2009-09-02 Thread Sturla Molden
V. Armando Solé skrev: I am looking for a way to have a non contiguous array C in which the left (1, 2000) elements point to A and the right (1, 4000) elements point to B. Any hint will be appreciated. If you know in advance that A and B are going to be duplicated, you can use