numpy-discussion

[Numpy-discussion] Numpy capabilities?

[Nancy K. <na...@MI...>]

Hi,

I will be working a lot with matrices, and I am wondering a few things
before I get started with NumPy:

1) Is there a function that performs matrix multiplication?

2) Is there a function that takes a tensor product, or Kronecker product, of
two matrices?

3) Is it possible to concatenate two matrices together?

4) Is there a way to insert a matrix into a subsection of an already
existing matrix. For instance, to insert a 2x2 matrix into the upper left
hand corner of a 4x4 matrix?

Thank you very much in advance!

Nancy

Re: [Numpy-discussion] Numpy capabilities?

[Konrad H. <hi...@cn...>]

On 25.01.2004, at 19:33, Nancy Keuss wrote:

> I will be working a lot with matrices, and I am wondering a few things
> before I get started with NumPy:
>
> 1) Is there a function that performs matrix multiplication?

Yes, Numeric.dot(matrix1, matrix2)

> 2) Is there a function that takes a tensor product, or Kronecker 
> product, of
> two matrices?

Yes, Numeric.multiply.outer(matrix1, matrix2)

> 3) Is it possible to concatenate two matrices together?

Yes: Numeric.concatenate((matrix1, matrix2))

> 4) Is there a way to insert a matrix into a subsection of an already
> existing matrix. For instance, to insert a 2x2 matrix into the upper 
> left
> hand corner of a 4x4 matrix?

Yes: matrix4x4[:2, :2] = matrix2x2

Konrad.