Re: behavior of arrays

[Jack Saba <jack(at)icesat1.gsfc.nasa.gov>]

But more often than not, I WANT the extra dimension to be lost, 
or at least I want IDL to be willing to ignore it where appropriate.
Consider this unrealistic example that nevertheless illustrates a 
problem that occurs all too often in IDL:

IDL> x=findgen(100)
IDL> ijk=where(x eq 10)
IDL> for i=ijk,99 do print, i
% Expression must be a scalar in this context: I.
% Execution halted at:  $MAIN$                 

I could have written i=ijk[0],99, or i=REFORM(ijk),99 to avoid the 
error. But it shouldn't be necessary -- this should be handled 
transparently.


"R.Bauer" wrote:
> 
> I have some problems to understand the logic which may be behind the
> handling of an array
> like defined.
> 
> Why is the result help, b.d  only [10] and not [10,1] ?
> 
> This means I will lose the information that's it is / was a 2-dim
> dataset.
> 
> R.Bauer
> 
> d=reform(findgen(10),10,1)
> help,d
> ;D               FLOAT     = Array[10, 1]
> 
> b=create_struct('d',d)
> help,b,/str
> 
> ;** Structure <1348428>, 1 tags, length=40, refs=1:
> ;   D               FLOAT     Array[10, 1]
> 
> help,b.d
> ; <Expression>    FLOAT     = Array[10]
> 
> c=b.d
> help,c
> ; C               FLOAT     = Array[10]