[Numpy-discussion] astype

Brennan Williams brennan.williams@visualreservoir....
Sat Feb 14 16:30:24 CST 2009


Nils Wagner wrote:
> On Sat, 14 Feb 2009 17:22:43 +0100
>   "Nils Wagner" <nwagner@iam.uni-stuttgart.de> wrote:
>   
>> Hi all,
>>
>> How can I convert an array with string elements to
>> an array with float entries ?
>>
>>
>>  
>>     
>>>>> coord_info[:,1]
>>>>>           
>> array(['0,0', '100,0', '200,0', '300,0', '400,0', 
>> '500,0', 
>> '600,0', '700,0', '800,0', '0.0', '100.0', '200.0', 
>> '300.0', '400.0', '500.0', '600.0',
>>        '700.0', '800.0', '0.0', '100.0', '200.0', 
>> '300.0', '400.0', '500.0', '600.0', '700.0', '800.0', 
>> '0.0', '100.0', '200.0', '300.0', '400.0',
>>        '500.0', '600.0', '700.0', '800.0', '0.0', 
>> '100.0', '200.0', '300.0', '400.0', '500.0', '600.0', 
>> '700.0', '800.0'],
>>       dtype='|S50')
>>
>>     
>>>>> coord_info[:,1].astype(float)
>>>>>           
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>> ValueError: invalid literal for float(): 0,0
>>
>>
>> Nils
>> _______________________________________________
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>> Numpy-discussion@scipy.org
>> http://projects.scipy.org/mailman/listinfo/numpy-discussion
>>     
>
>
> Sorry for the noise -  dots and commas were mixed up in 
> the input file.
>
>   
Mind you, it raises an interesting point. What if the string was an 
amount in currency, e.g. '$1,000.00' or perhaps just '1,000.00' etc.
How would one convert a string array in that format to a float array?

>    
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>   



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