Hi, i was tring out something like this import Numeric import LinearAlgebra import cmath import RandomArray import copy def sMatrix(pd, code, window): if window == 0: nprime = 1 else: nprime = window K, C = Numeric.shape(code) K1, L = Numeric.shape(pd) # check if K == K1 and raise an exception here sCode = Numeric.zeros([nprime*C,K*L*(window+1)],'d') for k in range(K): for l in range(L): code1 = copy.deepcopy(Numeric.array(code[k,0:C-pd[k,l]])) code1.shape = (C-pd[k,l],1) sCode1= Numeric.concatenate((Numeric.zeros([pd[k,l],1]),Numeric.zeros([C*window,1]),code1)) sCode[:, (window+1)*l+window*L*k] = copy.deepcopy(sCode1) return sCode if __name__ == "__main__": pd = Numeric.array([[2]]) code = Numeric.array([[-1,1,-1,1,1]]) np = sMatrix(pd,code,0) print np print "--"*30 np = sMatrix(pd,code,1) print Numeric.shape(np) print np print "--"*30 np = sMatrix(pd,code,2) print Numeric.shape(np) print np print "--"*30 ------------------------------ And i get struck with the following error message:: Traceback (most recent call last): File "sMatrix.py", line 31, in ? np = sMatrix(pd,code,0) File "sMatrix.py", line 24, in sMatrix sCode[:, (window+1)*l+window*L*k] = copy.deepcopy(sCode1) ValueError: Object too deep for desired array ------------ i think it is due to the many deep copy operations taht i am performing. i want to be in a position where slices of matrices should not be references, but should be copies itself and i should be able to move these copies around. (May be it is inefficient, but that is what i did in Matlab and want some compatibility, till i learn more of python and till i migrate to python completely). Is there a way out? Why is this an problem? Am i missing something. Best regards, karthik ----------------------------------------------------------------------- Karthikesh Raju, email: karthik@james.hut.fi Researcher, http://www.cis.hut.fi/karthik Helsinki University of Technology, Tel: +358-9-451 5389 Laboratory of Comp. & Info. Sc., Fax: +358-9-451 3277 Department of Computer Sc., P.O Box 5400, FIN 02015 HUT, Espoo, FINLAND -----------------------------------------------------------------------