[NumPy-Tickets] [NumPy] #1592: Formatting with arrayprint goes wrong

[NumPy Trac]

#1592: Formatting with arrayprint goes wrong
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 Reporter:  gaubi       |       Owner:  somebody
     Type:  defect      |      Status:  new     
 Priority:  normal      |   Milestone:          
Component:  numpy.core  |     Version:  1.4.0rc1
 Keywords:  formatting  |  
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Comment(by rgommers):

 Okay that makes sense. Guess I'm so used to this behavior it doesn't
 register as strange anymore. The offending lines are in
 core/arrayprint.py, lines 409-413:
 {{{
                 if max_val >= 1.e8:
                     self.exp_format = True
                 if not self.suppress_small and (min_val < 0.0001
                                            or max_val/min_val > 1000.):
                     self.exp_format = True
 }}}
 This is a little arbitrary. As a result:
 {{{
 >>> print(np.array([1e-3, 1e-4]))
 [ 0.001  0.   ]
 >>> print(np.array([1e-1, 1e-4]))
 [ 0.1  0. ]
 >>> print(np.array([1e0, 1e-4]))
 [  1.000e+00   1.000e-04]
 }}}
 There was a similar request here,
 http://thread.gmane.org/gmane.comp.python.numeric.general/22728, to create
 an option to force printing in scientific notation. Engineering notation
 (exponent is multiple of 3) would also be useful.

-- 
Ticket URL: <http://projects.scipy.org/numpy/ticket/1592#comment:3>
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