pasting numpy array into bigger array

[TG]

hi.

let's say I have :

from numpy import *
x = identity(5)
y = zeros((7,7))

I want to paste x into y, starting at coordinates (1,1) in order to
change y to something like this :

0 0 0 0 0 0 0
0 1 0 0 0 0 0
0 0 1 0 0 0 0
0 0 0 1 0 0 0
0 0 0 0 1 0 0
0 0 0 0 0 1 0
0 0 0 0 0 0 0

how would you do that ?

 

[Tim Heaney]

let's say I have :

from numpy import *
x = identity(5)
y = zeros((7,7))

I want to paste x into y, starting at coordinates (1,1) in order to
change y to something like this :

0 0 0 0 0 0 0
0 1 0 0 0 0 0
0 0 1 0 0 0 0
0 0 0 1 0 0 0
0 0 0 0 1 0 0
0 0 0 0 0 1 0
0 0 0 0 0 0 0

how would you do that ?

You can use Python slice notation for each dimension

y[1:6,1:6] = x

In general, I guess you want something like

y[1:1+x.shape[0], 1:1+x.shape[1]] = x

or

m, n = 1, 1
s, t = x.shape
y[m:m+s, n:n+t] = x

There is a mailing list for numpy

https://lists.sourceforge.net/lists/listinfo/numpy-discussion

You might have more luck asking your question on there.

I think it's a shame there isn't any free documentation for numpy.

Tim

 

[TG]

Thanks, that's exactly what I needed.

 

[Robert Kern]

I think it's a shame there isn't any free documentation for numpy.

Tosh.

http://www.scipy.org/Tentative_NumPy_Tutorial
http://www.scipy.org/Numpy_Example_List
http://www.scipy.org/doc/numpy_api_docs/numpy.html

--
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