Raik Gruenberg wrote: > Hi there, > > perhaps someone has a bright idea for this one: > > I want to concatenate ranges of numbers into a single array (for indexing). > So I > have generated an array "a" with starting positions, for example: > > a = [4, 0, 11] > > I have an array b with stop positions: > > b = [11, 4, 15] > > and I would like to generate an index array that takes 4..11, then 0..4, then > 11..15. > Does this help?
Python 2.5.4 (r254:67916, Dec 23 2008, 15:10:54) [MSC v.1310 32 bit (Intel)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> a = [4, 0, 11] >>> b = [11, 4, 15] >>> zip(a,b) [(4, 11), (0, 4), (11, 15)] >>> Apologies if I'm stating the obvious. -- jv > In reality, a and b have 10000+ elements and the arrays to be "sliced" are > very > large so I want to avoid any for loops etc. Any idea how this could be done? I > thought some combination of *repeat* and adding of *arange* should do the > trick > but just cannot nail it down. > > Thanks in advance for any hints! > > Greetings, > Raik > > > _______________________________________________ > Numpy-discussion mailing list > Numpy-discussion@scipy.org > http://projects.scipy.org/mailman/listinfo/numpy-discussion > _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
