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Re: Declaring large vectors in IDL [message #70472]

Sat, 17 April 2010 15:07

penteado
Messages: 866
Registered: February 2018

Senior Member
Administrator

On Apr 17, 5:02 am, fgg <fabioguimaraesgoncal...@gmail.com> wrote:
> Thanks for the suggestion. But what if the text file has more than one
> variable in it? Say "a" and "b".

That only depends on how you write them to the file. You should write
the file in the most convenient way, which will depend on what you
need to write, and where the values come from. If the values come from
some other software, the file generated by that software may be
directly readable.

If a and b have the same number of elements, one choice is to write
them as a table, with one column for each. Then it could be read
easily with read_ascii(), read_csv(), or in many other ways.

If they do not have the same length, then writing them using one line
for each may be more convenient, then they can be read with a
combination of readf and strsplit.

Or you may use key=value pairs, and read them, as Gray suggested, or
with gettok() from idlastro. If you have many variables of different
dimensions to be read (such as a file with many parameters on how to
do something, or metadata), this may be the most convenient way, since
it is easy to be read and edited by humans, and easy to parse. It is
even simple to write a general parser, which would return all key/
value pairs in a structure (or, when IDL 8 comes out, in a hash).

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[Message index]

		Re: Declaring large vectors in IDL By: penteado on Sat, 17 April 2010 15:07
		Re: Declaring large vectors in IDL By: Gray on Sat, 17 April 2010 07:22
		Re: Declaring large vectors in IDL By: fgg on Sat, 17 April 2010 01:02
		Re: Declaring large vectors in IDL By: Craig Markwardt on Fri, 16 April 2010 20:47
		Re: Declaring large vectors in IDL By: penteado on Fri, 16 April 2010 18:48
		Re: Declaring large vectors in IDL By: penteado on Fri, 16 April 2010 18:35
		Re: Declaring large vectors in IDL By: fgg on Mon, 19 April 2010 16:57
		Re: Declaring large vectors in IDL By: fgg on Mon, 19 April 2010 16:47
		Re: Declaring large vectors in IDL By: wallabadah on Sun, 18 April 2010 22:11

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