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Re: Adding x,y events to a 2d array (quickly) [message #86441 is a reply to message #86440]

Fri, 08 November 2013 08:11

Dick Jackson
Messages: 347
Registered: August 1998

Senior Member

Oliver wrote, On 2013-11-08, 6:18am:
> Hi again - thanks for all replies especially Dick's last with all the timings, which allows me to sheepishly admit that I solved the speed problem, but not how I expected to!
>
> Looking at the timings, which I could match in the test program but not in my main data program, it turns out that the single loop over the array contents was taking much longer as the array itself was buried in a structure.
>
> Creating a temporary array and looping over that increased the speed from ~30 seconds to ~2 seconds
>
> The red herring was that using the non looping method, the fact that it was in a structure hadn't affected the speed...
>
> (Although I stand by original message that the += operator doesn't work as you might expect with arrays!)
>
> Thanks again
>
> Oliver

You're most welcome. It is indeed counterintuitive that
array[indicesWithDuplicates] ++

is not equivalent to
array[indicesWithDuplicates] += 1

--

Cheers,
-Dick

Dick Jackson Software Consulting
Victoria, BC, Canada
www.d-jackson.com

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[Message index]

		Adding x,y events to a 2d array (quickly) By: oliver[1] on Thu, 07 November 2013 04:45
		Re: Adding x,y events to a 2d array (quickly) By: Russell Ryan on Thu, 07 November 2013 06:10
		Re: Adding x,y events to a 2d array (quickly) By: Dick Jackson on Thu, 07 November 2013 11:27
		Re: Adding x,y events to a 2d array (quickly) By: Phillip Bitzer on Thu, 07 November 2013 12:16
		Re: Adding x,y events to a 2d array (quickly) By: Dick Jackson on Thu, 07 November 2013 14:20
		Re: Adding x,y events to a 2d array (quickly) By: Michael Galloy on Thu, 07 November 2013 15:18
		Re: Adding x,y events to a 2d array (quickly) By: Dick Jackson on Fri, 08 November 2013 00:22
		Re: Adding x,y events to a 2d array (quickly) By: oliver[1] on Fri, 08 November 2013 01:19
		Re: Adding x,y events to a 2d array (quickly) By: oliver[1] on Fri, 08 November 2013 06:18
		Re: Adding x,y events to a 2d array (quickly) By: Dick Jackson on Fri, 08 November 2013 08:11

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