Summing specified elements in 2D array.

Hi!
I have a little problem with summing elements in 2D array… I have signal from 64 sources in the 2D array - 64 colums and (time*sampling) rows. I have to add some deley to every signal (different for each) and then sum signals from all of the sources. I hope the picture below explains what I have to do:
What's more - I have a 2D array of delays. By now I'm doing this by creating an 1D array of "0" and then putting in it the 1D signal array at index specified by delay value.
And it works ok. But... It takes long time... Is there any method to do the summing "at once" for all the delays? Is there sth like "pointer" in array, so I could take elements from the array from specified element?
Rgds,
Mordimer

One problem with your solution is also that the subset is of variable lenght due to truncation, so the shift register needs to be reallocated whenever the size changes. (Even if you define a lenght for the subset, you run out of elements and the result will be shorter!). You might want to e.g. truncate all to the shortest subset (longest delay) before summing for better inplaceness.
Why do you have a 2D array of delays? isn't the time spacing of each column constant?
What is your definition of "takes a long time": microseconds?, minutes?
Message Edited by altenbach on 12-03-2009 03:20 PM
LabVIEW Champion . Do more with less code and in less time .

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blawson wrote:
Been bitten by LabVIEW wrote:
I think one possibility I nixed was to use the refnum of the elements to determine which one it is. IIRC, this is not possible because the refnum of the element is for the edit box only.
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"mcmastal" a écrit dans le message news:
[email protected]..
> In LabVIEW6i, is there a way to make particular elements of an array
> invisible while the others stay visible (without losing any element's
> info.)?
>
> I have an array of clusters. Each cluster pertains to a certain
> oscilloscope I am controlling. There is another control which
> specifies which oscilloscopes I have "on".
> If a particular oscilloscope is "on" I want its cluster to be VISIBLE
> in the array. If a particular oscilloscope is "off" I want its
> cluster to be INVISIBLE in the array.
> How can I implement this in my program without losing ANY of the
> info. in my array?
LabVIEW, C'est LabVIEW

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P@Anand wrote:
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Unofficial Forum Rules and Guidelines
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Telemaque wrote:
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