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QuantumATK => General Questions and Answers => Topic started by: fangyongxinxi on December 13, 2012, 09:07

Title: How to use 'nlread' with 'object_id'
Post by: fangyongxinxi on December 13, 2012, 09:07

one nc file test.nc
two configurations in it, id, '111' and '222'
I wonder how to use nlread with object_id
I use
nlread('test.nc',BulkConfiguration,'222'),  failed
nlread(filename='test.nc',object_id='222')  failed

I know how to use nlread with list

but how to use nlread with object_id ?

Thank you~

Title: Re: How to use 'nlread' with 'object_id'
Post by: kstokbro on December 13, 2012, 14:52

You need to write the full id name, default id's are
gId000, ...
nlread(filename='test.nc',object_id='gID222')

Title: Re: How to use 'nlread' with 'object_id'
Post by: fangyongxinxi on December 13, 2012, 15:23

kk=nlread(filename='test.nc',object_id='222')[0]

my id full name is '222',

If the above line is: kk=nlread(filename='test.nc',object_id='222')
it's bad, this line shoud add "0"
I wonder why it should follow "0",    because the id is unique.

Title: Re: How to use 'nlread' with 'object_id'
Post by: Anders Blom on December 13, 2012, 16:41

This is just a programming detail. Even if the object ID is unique, the return type from nlread is always a list. So, in the case of using object ID the list has one element, that's why you use the 0th element. Having a uniform return type means it's much easier to write general functions.