[Numpy-discussion] manipulating lists

Nils Wagner nwagner@iam.uni-stuttgart...
Tue Mar 24 09:42:50 CDT 2009


On Tue, 24 Mar 2009 10:27:18 -0400
  josef.pktd@gmail.com wrote:
> On Tue, Mar 24, 2009 at 10:14 AM, Nils Wagner
> <nwagner@iam.uni-stuttgart.de> wrote:
>> Hi all,
>>
>> How can I extract the numbers from the following list
>>
>> ['&', '-1.878722E-08,', '3.835992E-11',
>> '1.192970E-03,-5.080192E-06']
>>
>> It is easy to extract
>>
>>>>> liste[1]
>> '-1.878722E-08,'
>>>>> liste[2]
>> '3.835992E-11'
>>
>> but
>>
>>>>> liste[3]
>> '1.192970E-03,-5.080192E-06'
>>
>> How can I accomplish that ?
>>
> 
> in python I would do this:
> 
>>>> ss=['&', '-1.878722E-08,', 
>>>>'3.835992E-11','1.192970E-03,-5.080192E-06']
>>>> li = []
>>>> for j in ss:
> 	for ii in j.split(','):   # assumes "," is delimiter
> 		try: li.append(float(ii));
> 		except ValueError: pass
>>>> li
> [-1.8787219999999999e-008, 3.8359920000000003e-011, 
>0.00119297,
> -5.0801919999999999e-006]
>>>> np.array(li)
> array([ -1.87872200e-08,   3.83599200e-11, 
>  1.19297000e-03,
>        -5.08019200e-06])
> 
> Josef
  
Thank you. Works like a charm.

Nils


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