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Re: structure references [message #86761 is a reply to message #86757]

Sun, 01 December 2013 17:18

spluque
Messages: 33
Registered: September 2013

Member

On Sun, 1 Dec 2013 11:52:25 -0800 (PST),
wlandsman <wlandsman@gmail.com> wrote:

> On Sunday, December 1, 2013 1:33:03 PM UTC-5, Sebastian Luque wrote:
>> Hi,

> In general, a structure contains elements of different types
> (e.g. string types) so

> x.(*)=20

> isn't allowed. Instead of a structure, you might look at the HASH()
> syntax which allows one to specify multiple hashes in a single call:

IDL> a = hash('a',double(0),'b',double(0), c:'string' ) a[['a','b']] =
IDL> 20.0d print,a
> c: string field a: 20.000000 b: 20.000000

Thanks, hashes do seem attractive for these purposes, however it's a
relatively new data type, so would require major changes in other parts
of the code. I might have to bite the bullet and stick to arrays, and
having code that looks like this:

FUNCTION FOO, A
return, [A*2, A^2, A^0.5]
END

;; Option 1
PRO BAR, B
x=foo(b)
x_dbl=x[0]
x_sqr=x[1]
x_sqrt=x[2]
... LOTS OF OPERATIONS WITH x_dbl, x_sqr, x_sqrt, x[*]
END
;; Option 2
PRO BAR, B
x=foo(b)
... LOTS OF OPERATIONS WITH x[0], x[1], x[2], x[*]
END

No problem, I personally prefer something like the latter but with a
little more meaningful nomenclature.

--
Seb

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[Message index]

		structure references By: spluque on Sun, 01 December 2013 10:33
		Re: structure references By: David Fanning on Sun, 01 December 2013 11:38
		Re: structure references By: spluque on Sun, 01 December 2013 11:46
		Re: structure references By: David Fanning on Sun, 01 December 2013 11:49
		Re: structure references By: wlandsman on Sun, 01 December 2013 11:52
		Re: structure references By: spluque on Sun, 01 December 2013 17:18
		Re: structure references By: Matthew Argall on Sun, 01 December 2013 20:44
		Re: structure references By: spluque on Thu, 05 December 2013 11:20

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