Re: equivalent for C-style init: structname varname[] = {...} ?

[Sergei Steshenko]

----- Original Message -----
> From: Yury T. <address@hidden>
> To: address@hidden
> Cc: 
> Sent: Wednesday, November 14, 2012 6:32 PM
> Subject: Re: equivalent for C-style init: structname varname[] = {...} ?
> 
> Jordi Gutiérrez Hermoso-2 wrote
>>>  Arrgh! :) Sorry, I'd better go with Sergei's solution or with 
> R, indeed.
>>>  Thank you all the same.
>> 
>>  Sergei's if anything, is gonna be even *more* complicated, because
>>  you'll have to replace {s.data} with a bigger expression so you can
>>  select the ones you want.
> 
> Actually, not so. Here's adaptation of my recent example with access to an
> individual fields of an item selected by arbitrary key. Reads almost
> naturally, right?
> Of course, I wasn't shown how make a full range iteration for such a data
> structure, so will have to work that out by myself :).
> 
>   s = consistent_struct\.
>   (.
>   "Buffat+Borel 1976 (5)", {"Buffat+Borel 1976 (5)", 13, 
> 1337},
>   "Coombes 1972 (2)", {"Coombes 1972 (2)", 13, 1337},
>   "Lai+Guo+Petrova+ 1996 (2a)", {"Lai+Guo+Petrova+ 1996 
> (2a)", 30, 505}
>   );.
> .
>   getfield( s, "Coombes 1972 (2)" ){1}.
>   getfield( s, "Coombes 1972 (2)" ){2}.
>   getfield( s, "Coombes 1972 (2)" ){3}.
> 
> 
> 
> 
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Pay attention to 'help fieldnames' in the session below:

"
octave:3> help fieldnames
`fieldnames' is a built-in function

 -- Built-in Function:  fieldnames (STRUCT)
     Return a cell array of strings naming the elements of the structure
     STRUCT.  It is an error to call `fieldnames' with an argument that
     is not a structure.


Additional help for built-in functions and operators is
available in the on-line version of the manual.  Use the command
`doc <topic>' to search the manual index.

Help and information about Octave is also available on the WWW
at http://www.octave.org and via the address@hidden
mailing list.
octave:4> s.f1 = 1
s =

  scalar structure containing the fields:

    f1 =  1

octave:5> s.f2 = 2
s =

  scalar structure containing the fields:

    f1 =  1
    f2 =  2

octave:6> fields = fieldnames(s)
fields =
{
  [1,1] = f1
  [2,1] = f2
}
octave:7> for fn = 1:numel(fields) printf("f=%s\n", fields{fn}); endfor
f=f1
f=f2
".

'fieldnames' is like 'keys' built-in Perl function.

Regards,
  Sergei.





octave:8>