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Re: dymamic memory allocation [message #41886 is a reply to message #41882]

Sun, 05 December 2004 18:16

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

Francois wrote:
> Hello,
>
> How to dynamically allow memory for an array ?
> For example, to declare a 2D array of 30 columns by 40 lines, you type
> this code:
> a = intarr(30,40)
>
> But if you don't know, before compilation, the number of dimensions of
> the array, how do we do this ?
>
> Thank you,
>
> Franï¿½ois.

In IDL, variables are created at run time and do not need to be
"declared" beforehand. Consider the following code

pro test
a = dist(30,40)
surface, a
a = 'My string'
print, a
end

The first line of the procedure creates a floating point array
dimensioned (30,40) and associates the variable name "a" with it. (The
dimensions in this example are known at compile time, but they do not
need to be.) The second line plots it as a surface plot. The third line
creates a string and associates the name "a" with it. (The array created
in line 1 is no longer accessible to IDL and the memory associated with
it may--or may not--be returned to the operating system.) The fourth
line prints the string to the console.

--
Mark Hadfield "Ka puwaha te tai nei, Hoea tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		Re: dymamic memory allocation By: Mark Hadfield on Mon, 06 December 2004 12:50
		Re: dymamic memory allocation By: Marc Reinig on Mon, 06 December 2004 10:08
		Re: dymamic memory allocation By: enod on Mon, 06 December 2004 07:27
		Re: dymamic memory allocation By: enod on Mon, 06 December 2004 07:27
		Re: dymamic memory allocation By: Mark Hadfield on Sun, 05 December 2004 18:16

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