Jim Vickroy wrote: > 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)] > >>>
Mhm, I got this far. But how do I get from here to a single index array [ 4, 5, 6, ... 10, 0, 1, 2, 3, 11, 12, 13, 14 ] ? Greetings Raik > > 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 > > -- ________________________________ Dr. Raik Gruenberg http://www.raiks.de/contact.html ________________________________ _______________________________________________ Numpy-discussion mailing list Numpy-discussion@scipy.org http://projects.scipy.org/mailman/listinfo/numpy-discussion
