Konrad Hinsen schrieb:

On Monday 28 July 2003 16:26, Nils Wagner wrote:

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Konrad Hinsen schrieb:

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How can I delete a column/row from a matrix.

As an in-place operation, not at all. To get a copy of an array with some columns/rows removed, use Numeric.take.

The in-place operation of matlab is a nice feature. Is it thinkable to have this in scipy or numarray at a later date ?

I'd say that the obvious way to implement it is as

del a[2:3,:]

That can certainly be done, but someone has to do it.

Personally, I am not convinced that it is very useful. The consequences of an in-place change can be disastrous when many references point to that array. But then, we have other in-place operations which sometimes are handy, so my usefulness estimation may be wrong.

Konrad.

In my opinion, this operation is quite useful. For example a finite element model where we have to impose several homogeneous boundary conditions. This can be done by deleting columns and associated rows. Nils In any case I am interested in a reliable workaround for this feature. A small example would be appreciated. Thanks in advance.

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