On Mar 17, 10:57=A0am, "R.G. Stockwell" <notha...@[EMAIL PROTECTED]
> wrote:
> "Raghu" <raghuram.narasim...@[EMAIL PROTECTED]
> wrote in message
>
>
news:3db3001e-8c15-45a8-814c-9ffc92f43df8@[EMAIL PROTECTED]
>
>
>
>
>
> > Hi,
>
> > With reference to my recent posting (IDL batch indexing), i understood
> > that i could structures. However, i haven't been able to figure out
> > one step.
>
> > Here is my code as of now:
> > ; I want to search for all the images(files) in the directory trials,
> > read them into the structure named data, and access each file within
> > the structure.
>
> > pro strcutres
> > dir1=3D'D:\trials'
> > cd,dir1
> > files=3DFILE_SEARCH('*[^\.{hdr}]', /QUOTE,count=3Dnumfiles)
> > i=3D0
> > while i lt numfiles do begin
> > named=3Dfiles(i)
> > print,named
> > data=3D{ID:'a',sizes:fltarr(2179,761)}
> > data=3Dreplicate(data,numfiles)
> > data.sizes=3Dfindgen(numfiles)
> > openr,1,named
> > readu,1,data[i].sizes
> > close,1
> > i=3Di+1
> > endwhile
> > end
>
> > ERROR message- READU: Expression must be named variable in this
> > context: <FLOAT =A0 =A0 Array[2179, 761]>.
>
> > I am getting the error here because it seems like i am not able to
> > read in the LUN 1 or named, into data[i].sizes.
>
> > Where am i going wrong ?
>
> > Raghu
>
> I'm not sure if it has been explained, but your error message
> is telling you that readu,1,data[i].sizes does now work,
> because data[i].sizes is an expression. =A0It is similar to
> readu,1,x + 4
> or
> readu, 1, abs(array)
>
> in that IDL executes the data[i].sizes almost like it was a
> function, and it returns the array you request (i.e. the 'sizes'
> field of the fourth element of the data array).
>
> Just read it directly into an array, the assign the array to the
> structure in a second line.
>
> The fact that your filename is called "named" and the error message
> says you need a "named array" is just a coincedence.
>
> ALSO, =A0look at the line:
> data.sizes=3Dfindgen(numfiles)
>
> I am not sure this is doing what you want it to do.
>
> Cheers,
> bob- Hide quoted text -
>
> - Show quoted text -
Hi,
Yea, the findgen statement is not doing anything. Initially, i thought
i'd use that to generate an array of the number of files i need. But
it assigns values to it and i don't want that. I wanted something like
an empty list.
Thanks for the explaination of the named variable. I'm clear now.
Raghu
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