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IDL Way to have a single row/collum act on all rows/collums in an array [message #89540]

Fri, 24 October 2014 07:32

JTMHD
Messages: 9
Registered: October 2014

Junior Member

Hi Guys,

What I am trying to do is analogous to the following

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
timedistancearray =FINDGEN(3,3)

timezero = timedistancearray(*,0)

timedistance_minustimezero = FLTARR(3,3)

FOR t=0,2 DO timedistance_minustimezero(*,t)=timedistancearray(*,t)-timez ero
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

The thing is in this case the array is HUGE so I don't think the FOR loop would be optimum.

The other thing I thought about was taking the timezero array and changing it into a 2D array of the correct dimensions, e.g.

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;

timedistancearray =FINDGEN(3,3)

timezero = timedistancearray(*,0)#MAKE_ARRAY(1, 3, /DOUBLE, VALUE = 1D0)

timedistance_minustimezero = timedistancearray-timezero

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;

But again, this perhaps isn't ideal as it will involve creating an equally huge array to do the operation which will have add to the memory overhead.

I keep hearing that if you want to get good at IDL you have to exploit the array operations properly - what other options do I have here?

Thanks in advance

Jonathan

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[Message index]

		IDL Way to have a single row/collum act on all rows/collums in an array By: JTMHD on Fri, 24 October 2014 07:32
		Re: IDL Way to have a single row/collum act on all rows/collums in an array By: rryan%stsci.edu on Fri, 24 October 2014 07:49
		Re: IDL Way to have a single row/collum act on all rows/collums in an array By: wlandsman on Fri, 24 October 2014 08:11
		Re: IDL Way to have a single row/collum act on all rows/collums in an array By: JTMHD on Mon, 27 October 2014 05:13

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