Perfect! It works. Thanks Bruno. Bruno Desthuilliers wrote: > bei a écrit : > <ot> Please don't top-post</ot> > > > Hi,Simon, > > > > Thanks for your reply.It's very helpful :) > > But I am sorry for my given example.Actually, my data in the arrays are > > all float point datas.And I use integer in the example.The code is like > > this. > > ("x,v,...,h" are floating point number arrays) > > Arrays or lists ? > > > pos=str(x) > > Why on earth are you doing this ? > > > vel=str(v) > > ene=str(u) > > den=str(rho) > > pre=str(P) > > hms=str(h) > > datas=zip(pos,vel,ene,den,pre,hms) > > datas = zip(v, u, rho, P, h) > > > filename="data.dat" > > file=open(filename,"w") > > This shadows the builtin 'file' type. Using another name may be a good idea. > > > for datum in datas: > > print >>file, ' '.join(datum) > print >> file, ' '.join(map(str, datum)) > > > file.close() > > > > > > > > However, the result seperate each point in floating number , but not > > regard them as a whole. It's like this : > > > > > > [ [ [ [ [ [ > > - 0 1 1 1 0 > > 0 . . . . . > > . 0 4 0 0 0 > > 5 , 9 , , 0 > > 9 9 3 > > (snip) > > One of the nice things with Python is the interactive shell. Let's use it: > Python 2.4.1 (#1, Jul 23 2005, 00:37:37) > [GCC 3.3.4 20040623 (Gentoo Linux 3.3.4-r1, ssp-3.3.2-2, pie-8.7.6)] on > linux2 > Type "help", "copyright", "credits" or "license" for more information. > >>> a = map(float, range(0,3)) > >>> a > [0.0, 1.0, 2.0] > >>> b = map(float, range(12, 15)) > >>> c = map(float, range(7, 10)) > >>> a, b, c > ([0.0, 1.0, 2.0], [12.0, 13.0, 14.0], [7.0, 8.0, 9.0]) > >>> str(a) > '[0.0, 1.0, 2.0]' > >>> list(str(a)) > ['[', '0', '.', '0', ',', ' ', '1', '.', '0', ',', ' ', '2', '.', '0', ']'] > >>> zip(str(a), str(b), str(c)) > [('[', '[', '['), ('0', '1', '7'), ('.', '2', '.'), ('0', '.', '0'), > (',', '0', ','), (' ', ',', ' '), ('1', ' ', '8'), ('.', '1', '.'), > ('0', '3', '0'), (',', '.', ','), (' ', '0', ' '), ('2', ',', '9'), > ('.', ' ', '.'), ('0', '1', '0'), (']', '4', ']')] > >>> zip(a, b, c) > [(0.0, 12.0, 7.0), (1.0, 13.0, 8.0), (2.0, 14.0, 9.0)] > >>> > > HTH
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