[NumPy-Tickets] [NumPy] #1674: Problems outputting elements of ndarray

NumPy Trac numpy-tickets@scipy....
Sun Nov 14 22:53:49 CST 2010


#1674: Problems outputting elements of ndarray
--------------------+-------------------------------------------------------
 Reporter:  pv00    |       Owner:  somebody
     Type:  defect  |      Status:  new     
 Priority:  normal  |   Milestone:  2.0.0   
Component:  Other   |     Version:  1.5.0   
 Keywords:          |  
--------------------+-------------------------------------------------------
 Hi, what is the best way to print (to a file or to stdout)
 formatted numerical values?

 Numpy Documentation only discusses input *from* a file,
 or output of entire arrays.
 I just want tab or space-delimited output of formatted values.

 I tried to follow python documentation and find errors. Below is ipython
 -pylab transcript:

 In [2] import numpy as np
 In [3]: w = np.arange (1,5,dtype=np.int32).reshape((2,2))
 In [4]: w
 Out[4]:
 array([[1, 2],
        [3, 4]], dtype=int32)

 In [5]: w[0,0]
 Out[5]: 1

 In [6]: w[0,0].__class__
 Out[6]: <type 'numpy.int32'>

 In [7]: print('{0:2d}'.format(w[0,0]))
 ---------------------------------------------------------------------------
 ValueError                                Traceback (most recent call
 last)

 /home/p/o/dev/thesis/python/wavelet/<ipython console> in <module>()

 ValueError: Unknown format code 'd' for object of type 'str'

 In [8]:

-- 
Ticket URL: <http://projects.scipy.org/numpy/ticket/1674>
NumPy <http://projects.scipy.org/numpy>
My example project


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