Re: Working with Preexisting Data Set

["J.D. Smith" <jdsmith(at)astro.cornell.edu>]

William Baird wrote:
> 
> Okay.  HEre's my problem.  I am grovelling before you guys for a bit of
> help, cuz I'm stuck and I'm, unfortunately, what passes for an expert around
> here.  :/
> 
> Ideally I would like to concatinate some data structures.  Or more specifically,
> the data in the array of ints in the DATA structure below.
> 
> ** Structure $10, 11 tags, 6510928 length:
>    NAME       STRING    '**********'
>    MISSION    STRING    '**********'
>    LOCATION   STRING    '**********'
>    RECORDING  STRING    '**********'
>    STREAMNAME STRING    '**********'
>    TITLE      STRING    '**********'
>    LABEL      STRING    '**********'
>    SAMPLERATE FLOAT           xxxxxx.
>    EPOCH      STRING    'xxxx:xxx:xx:xx:xx.xxxxxx'
>    TIME       STRUCT    -> $7 Array(1)
>    DATA       STRUCT    -> $9 Array(1)
> 
> ** Structure $9, 3 tags, 6510816 length:
>    UNITS STRING    'COUNTS'
>    DATA  INT       Array(3255400)
>    LABEL STRING    ''
> 
> I have tried the following:
> 
> e=a
> e.(10).(1)=[a.(10).(1),b.(10).(1),c.(10).(1),d.(10).(1)]
> 
> but it complains:
> % Conflicting data structures: <INT       Array(12943700)>,MISSING.
> % Execution halted at $MAIN$  .
> 

A structure member which is a named array (such as in your DATA field above) can
only have arrays of the same size put into it.  Once the structure is defined,
you're stuck to the array size you've specified.

E.g.:

a={TEST1,a:fltarr(3)}
a.a=fltarr(4)
% Conflicting data structures: structure tag,<FLOAT     Array[4]>.
% Execution halted at:  $MAIN$ 

You can't fit the new data in.  This is your problem.  Using pointers solves it.

JD


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