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Re: confused multiplying arrays [message #73480 is a reply to message #73479]

Thu, 11 November 2010 13:33

penteado
Messages: 866
Registered: February 2018

Senior Member
Administrator

On Nov 11, 7:11 pm, Paula <paulartcoe...@gmail.com> wrote:
> IDL> help,area,fluxes
> AREA FLOAT = Array[2000]
> FLUXES FLOAT = Array[2000, 112864]
>
> I want the i-th element in area AREA[i] to multiply all elements in
> the corresponding 2nd dimension in fluxes FLUXES[i,*] and then sum up
> all the 2000 resulting fluxes, i.e., using loop:
>
> for i = 0,1999 do begin
> TOTAL_FLUX = TOTAL_FLUX + AREA[i]*reform(FLUXES[i,*])
> endfor
>
> i've been trying to figure out (without success) how to compute
> TOTAL_FLUX without the loop using TOTAL(). ideas?

If I understand it right, you want total_flux to be a 112864-element
array, where each is the sum of all 2000 elements in the corresponding
line of fluxes, weighted by area. So, if there is enough memory, it
could be done with

total_flux=total(rebin(area,100,112864)*fluxes,1)

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[Message index]

		Re: confused multiplying arrays By: MC on Thu, 11 November 2010 16:49
		Re: confused multiplying arrays By: penteado on Thu, 11 November 2010 13:47
		Re: confused multiplying arrays By: paulartcoelho on Thu, 11 November 2010 13:46
		Re: confused multiplying arrays By: paulartcoelho on Thu, 11 November 2010 13:41
		Re: confused multiplying arrays By: penteado on Thu, 11 November 2010 13:33

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