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Re: Unable to allocate memory: to make array for panchromatic file [message #89181 is a reply to message #89180]

Thu, 31 July 2014 01:07

Fabzi
Messages: 305
Registered: July 2010

Senior Member

Hi,

On 31.07.2014 09:40, phamlien24@gmail.com wrote:
> % Unable to allocate memory: to make array.
> Not enough space

try to "clean" your code.

Avoid declaring too many variables and either reassign the ones that are
not used anymore and pollute your memory or make use of temporary()

For example, this is bad:
IDL> ones = fltarr(5000,5000) + 1
IDL> twos = ones + 1

After these two statements you'll have two large arrays in memory even
if "ones" is not needed anymore. Two alternatives:

; Reassign
IDL> twos = fltarr(5000,5000) + 1
IDL> twos = twos + 1

; Temporary
IDL> ones = fltarr(5000,5000) + 1
IDL> twos = temporary(ones) + 1

To take an example of your code:

br=fltarr(ns,1,nl)
br = (pan *(K_pan)/(Pan_Width))*0.1

The first assignment is useless and memory expensive. Since IDL is
dynamically typed, there is absolutely no need to declare the variable
"br" since it will be overwritten on the next line.

Cheers,

Fabien

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[Message index]

		Unable to allocate memory: to make array for panchromatic file By: phamlien24 on Thu, 31 July 2014 00:40
		Re: Unable to allocate memory: to make array for panchromatic file By: Fabzi on Thu, 31 July 2014 01:07
		Re: Unable to allocate memory: to make array for panchromatic file By: phamlien24 on Thu, 31 July 2014 01:27
		Re: Unable to allocate memory: to make array for panchromatic file By: phamlien24 on Thu, 31 July 2014 01:47
		Re: Unable to allocate memory: to make array for panchromatic file By: Josh Sixsmith on Thu, 31 July 2014 04:26

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