On 8/29/06, Mathew Yeates <[EMAIL PROTECTED]> wrote: > I have an M by N array of floats. Associated with the columns are > character labels > ['a','b','b','c','d','e','e','e'] note: already sorted so duplicates > are contiguous > > I want to replace the 2 'b' columns with the sum of the 2 columns. > Similarly, replace the 3 'e' columns with the sum of the 3 'e' columns.
Make a cumsum of the array. Find the index of the last 'a', last 'b', etc and make the reduced array from that. Then take the diff of the columns. I know that's vague, but so is my understanding of python/numpy. Or even more vague: make a function that does what you want. ------------------------------------------------------------------------- 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
