something like this? def list2index(L): uL=sorted(set(L)) idx=dict((y,x) for x,y in enumerate(uL)) return uL,asmatrix(fromiter((idx[x] for x in L),dtype=int))
//Torgil On 8/29/06, Keith Goodman <[EMAIL PROTECTED]> wrote: > On 8/29/06, Tim Hochberg <[EMAIL PROTECTED]> wrote: > > Keith Goodman wrote: > > > I have a very long list that contains many repeated elements. The > > > elements of the list can be either all numbers, or all strings, or all > > > dates [datetime.date]. > > > > > > I want to convert the list into a matrix where each unique element of > > > the list is assigned a consecutive integer starting from zero. > > > > > If what you want is that the first unique element get's zero, the second > > one, I don't think the code below will work in general since the dict > > does not preserve order. You might want to look at the results for the > > character case to see what I mean. If you're looking for something else, > > you'll need to elaborate a bit. Since list2index doesn't return > > anything, it's not entirely clear what the answer consists of. Just idx? > > Idx plus uL? > > The output I wanted (in my mind, but unfortunately not in my previous > email) is idx and uL where uL[0] corresponds to the zeros in idx, > uL[1] corresponds to the ones in idx. etc. > > I'd also like the uL's to be ordered (now I see that characters and > dates aren't ordered, ooops, thanks for telling me about that). Or > optionally ordered by a second list input which if present would be > used instead of the unique values of L. > > Thank you all for the huge improvements to my code. I'll learn a lot > studying all of them. > > ------------------------------------------------------------------------- > Using Tomcat but need to do more? Need to support web services, security? > Get stuff done quickly with pre-integrated technology to make your job easier > Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo > http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 > _______________________________________________ > Numpy-discussion mailing list > Numpy-discussion@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/numpy-discussion > ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Numpy-discussion mailing list Numpy-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/numpy-discussion
