comp.lang.idl-pvwave archive - RDF feed
type: channel
description: Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
items: structures, driving me crazy

structures, driving me crazy
type: item
description: Hi! I have a dataset of images with corresponding header files. The header files (which i want to read) consist of three float numbers, and then 9 rows of data with 8 elements each. Each row corresponds to a spectal band of the image. i've got 138 images all related, so i want to have all the headers open and related. I thought about creating a structure for each band: att={roll:0.0,pitch:0.0,head:0.0,utme:0L,utmn:0L,alt:0.0,vel :0.0} and then create an array of structures band=replicate(att,9) then create a header structure header={date:'',sunazi:0.0,sunzen:0.0,bias:0.0,band:???} and then replicate it for the whole set: image=replicate(header,138) of course i found several problems. First, i didn't know how to initialize the tag band as a structure array of the type band in the structure definition of header. second, i tryed to use concatenation of structures, of the kind: p = CREATE_STRUCT('A', 1, 'B', 'xxx') p = CREATE_STRUCT('FIRST', 0, p, 'LAST', 3) so i tried: header=create_struct('date',"",'sunazi',0.0,'sunzen',0.0,'bias',0.0,band) i know there are workarounds, as using separate structures for bands and the rest of the header... but i thought there MUST be a way of putting it all together, and being able to access data as: image[102].date as well as image[102].band[3].utme So, what am i missing? David, i guess this is somehow explained in your book, and i'm getting it for christmass. But i'd like to have the answer a bit sooner ;) Greetings, Luis =)
creator: Luis Alonso
date: 2000-11-24T08:00:00-00:00