On Mon, 16 Aug 2010 22:56:20 -0500, Robert Kern wrote: > On 8/16/10 9:29 PM, Roy Smith wrote: >> In article<i4cqg0$ol...@lust.ihug.co.nz>, >> Lawrence D'Oliveiro<l...@geek-central.gen.new_zealand> wrote: >> >>> In message<roy-ee1b7f.21001716082...@news.panix.com>, Roy Smith wrote: >>> >>>> 5) real intensity[160.0 : 30.0 : 0.01] >>> >>> How many elements in that array? >>> >>> a) 2999 >>> b) 3000 >>> c) neither of the above >> >> c) neither of the above. More specifically, 13,001 (if I counted >> correctly). > > 13000, actually. Floating point is a bitch. > > [~/Movies] > |1> import numpy > > [~/Movies] > |2> len(numpy.r_[160.0:30.0:-0.01]) > 13000
Actually, the answer is 0, not 13000, because the step size is given as 0.01, not -0.01. >>> import numpy >>> len(numpy.r_[160.0:30.0:-0.01]) 13000 >>> len(numpy.r_[160.0:30.0:0.01]) 0 -- Steven -- http://mail.python.org/mailman/listinfo/python-list
