Hello !

I'm a new user of Numpy. I want to use it to work with matrices (very

huge matrices), select column, make product, etc ...

Configuration : Debian, python 2.4.4 and numpy 1.0.1

So here is my problem:

I initialize a matrix which will contain only 0 and 1

>>> from numpy import *

>>> matCons = zeros((194844,267595)),dtype=int8)

then I put the 1s according to my conditions

>>> for i in range(194844):

try:

clusters = consensus[namesP[i]]

except KeyError:

continue

for clus in clusters:

ind = argmax(namesC.find(clus)) # search of index

matrix[i,ind] = 1

finaly I want to select some columns in this matrix.

So I did for example:

>>> matCons[:,(1,2)]

and I obtain the segmentation fault.

I try to select one column by one, which is possible :

>>> a = matCons[:,1]

but if I try to put it in a new matrix, I have again te segmentation fault

>>> tmp = zeros((194844,2),int8)

>>> tmp[:,0] = a

I make some tests like this one :

----------------------------------------------------------

>>> matrix = zeros((194844,267595),int8)

>>> a = matrix[:,0]

>>> for i in range(len(a)):

print i, a[i]

...

...

2221 0

2222 0

2223 0

2224 0

2225 0

2226 0

2227 0

2228 0

2229 0

2230 0

2231 0

2232 0

2233 0

2234 0

2235 0

2236 0

2237 0

2238 0

2239 0

2240 0

2241 95

2242 0

2243 0

2244 101

2245 0

2246 15

2247 -112

2248 -115

2249 -1

2250 84

2251 -99

2252 -1

2253 60

2254 -49

2255 -1

2256 17

2257 -35

2258 -119

2259 -35

2260 -1

2261 52

2262 -1

2263 -1

2264 -35

2265 -1

2266 121

2267 1

2268 0

2269 0

2270 0

2271 0

2272 28

2273 50

2274 4

2275 -1

2276 -24

2277 0

2278 0

2279 0

2280 -58

2281 0

2282 0

2283 0

2284 0

2285 -1

2286 -69

2287 12

2288 -36

2289 8

2290 66

Erreur de segmentation

------------------------------------------

But if I do the same things on a matrix with dimension 194844*300, it

works well.

So if someone can explain me why it does not work in my case...

Thanks in advance.

Anne-Sophie

--

Anne-Sophie Sertier, Doctorante monitrice

UMR 5558, Laboratoire de Biométrie et Biologie Evolutive

Université Lyon1, bât G. Mendel 2è étage

43 bd du 11 novembre 1918

69622 Villeurbanne cedex

France

Tel: 04 26 23 44 76

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