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Re: Error when calling ENVI_WRITE_ENVI_FILE [message #86337 is a reply to message #86335]

Mon, 28 October 2013 09:34

Phillip Bitzer
Messages: 223
Registered: June 2006

Senior Member

Hi Simon-

First, some terminology. You can have an "array of structures". You can also have a "structure with tags that are arrays".

Before we jump into it, the use of help is much more, well, helpful, than print. You'll see this in action below.

Consider this variable:

IDL> str = {data:FLTARR(3, 3)}

Notice "str" is a structure, and "data" is a tag (or field) of "str". Try this:

IDL> help, str

So, "str" is in fact a structure. In order to access the tag data, we use:

IDL> help, str.data

So, str.data (again, the tag "data" in the structure "str") is a 3x3 float array.

Print it if you'd like:
IDL> print, str.data

This is how you deal with a "structure that has tags that are arrays".

-------

We can take this further. Consider:
arrOfStr = REPLICATE(str, 2)

Now, 'arrofStr' is an "array of structures". See for yourself:
IDL> help, arrOfStr

You can print this too:
IDL> print, arrOfStr

What you *really* want is the data tag from each structure:
IDL> help, arrOfStr.data
IDL> print, arrOfStr.data

-------

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[Message index]

		Error when calling ENVI_WRITE_ENVI_FILE By: Simon Mitchell on Fri, 25 October 2013 08:35
		Re: Error when calling ENVI_WRITE_ENVI_FILE By: Phillip Bitzer on Fri, 25 October 2013 09:02
		Re: Error when calling ENVI_WRITE_ENVI_FILE By: Josh Sixsmith on Fri, 25 October 2013 14:57
		Re: Error when calling ENVI_WRITE_ENVI_FILE By: Simon Mitchell on Mon, 28 October 2013 08:55
		Re: Error when calling ENVI_WRITE_ENVI_FILE By: Phillip Bitzer on Mon, 28 October 2013 09:34
		Re: Error when calling ENVI_WRITE_ENVI_FILE By: Josh Sixsmith on Mon, 28 October 2013 18:07
		Re: Error when calling ENVI_WRITE_ENVI_FILE By: Simon Mitchell on Fri, 01 November 2013 04:17

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