What's the most straightforward way to count, say, the number of 1s or Trues in the array? Or the number of any integer?
I was surprised to discover recently that there isn't a count() method as there is for Python lists. Sorry if this has been discussed already, but I'm wondering if there's a reason for its absence. I came across a thread in March: http://aspn.activestate.com/ASPN/Mail/Message/numpy-discussion/3066460 that talked a bit about this in terms of speed, but what about just the convenience of having a count() method? Looks like masked arrays have a count method, don't know much about them though. Also, I understand the inaccuracies when converting between binary and decimal floating point representations, and therefore making counting of a specific float value in an array somewhat undefined, yet it seems to work in Python lists: >>> 1.1 1.1000000000000001 >>> a=[1.1, 1.1, 1.2] >>> a [1.1000000000000001, 1.1000000000000001, 1.2] >>> a.count(1.1) 2 >>> a.count(1.1000000000000001) 2 >>> a.count(1.2) 1 Comments? Martin ------------------------------------------------------------------------- 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
