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Re: structures? [message #85786 is a reply to message #85772]

Sun, 08 September 2013 06:37

peterkamatej
Messages: 2
Registered: September 2013

Junior Member

Hi Seb,

it seems to me that you might need some dynamic data structure, because there might be a different number of rows needed for each day. Also, a structure array is represented internally as just one "IDL Variable" and it needs to be stored in one solid block of computer memory. This could be quite resource-unfriendly if it's going to be very large (say, hundreds of MB). Especially, if you decide to enlarge the array, a new solid block of memory has to be allocated, the contents copied there and eventually the original memory can be freed.

You could use pointer array instead, but I recommend using the new dynamic data types introduced in IDL 8, HASH() and LIST(). I guess they work internally through pointers, so each part of the large data structure can be at different place in the memory, which is certainly more resource-friendly. However, the way you work with HASH() or LIST() is in many aspect similar to using normal arrays, which is also quite user-friendly (unlike using pointers).

Try looking to the IDL Help at these two data types and see if it suits to you.

Matej

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[Message index]

		structures? By: Seb on Thu, 05 September 2013 08:26
		Re: structures? By: Phillip Bitzer on Fri, 06 September 2013 07:06
		Re: structures? By: peterkamatej on Sun, 08 September 2013 06:37
		Re: structures? By: spluque on Wed, 25 September 2013 14:57
		Re: structures? By: spluque on Thu, 26 September 2013 07:42
		Re: structures? By: chris_torrence@NOSPAM on Thu, 26 September 2013 16:34

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