How can I create sub-arrays based on the positions of indicies in a separate index array?

Please forgive me if this question is basic or obvious. I am fairly new to LabVIEW and I'm trying to learn as I go along.
I have a 1D array of index values (the number of possible index values is not fixed, but can vary between uses of the application; it could be just {0, 1} on one day and {1, 5, 11, 678} on another) and a 1D array of measurement values (doubles). I'd like to parse the measurement values into sub-arrays for each index, so that if my index array was:
[0 1 1 1 1 5 5 0 5 5 1 0 1 1 5]
and my measurement array was:
[0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 0.10 0.11 0.12 0.13 0.14 0.15]
I would get back 3 sub-arrays:
[0.1 0.8 0.12]
[0.2 0.3 0.4 0.5 0.11 0.13 0.14]
[0.6 0.7 0.9 0.10 0.15]
I know there must be a simple way to do this, I guess I'm just stuck too much in matlab-array thinking to figure it out... please help!
-- jph
Solved!
Go to Solution.

jamespherman wrote:
Thus, I figured it might be possible to generalize this idea and send multiple sets of XY values to an XY graph.
OK, all we need is a trivial modification of what we already have. XY graph data is easiest handled using complex data. Here's a quick rewrite. See if this works for you.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
SplitInGroupsGraph.vi ‏14 KB

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Create sub-arrays based on the positions of indicies in a separate index array?

I have a 1D array of index values and a 1D array of measured values. As an example:
Index array: 1, 2, 4, 7, 126, 127,129, 214, 215
Measurement array: 5, 6, 8, 4, 4, 9, 8, 7, 5
I want to get sub-arrays of measurement array (three for this example):
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A sub-array is generated when there is a big gap (this value is known) between consecutive elements of Index array (126-7, 214-129, this value is known, say 80).
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Thanks
Solved!
Go to Solution.

Alice12 wrote:
I tried to generate your program but there is some problem (I dont know the false case).
And I want to find the maxima of each sub-array and then find their average (this should be the final output).
You have it mostly right. I explained in my post what's in the false case: an increment (+1) for the top shift register. The other wires pass straight through. The image I posted is a "snippet" - it's actual code. You can drag it into a block diagram (with some web browsers, you will need to drag to your desktop first, and from there to the block diagram). There is a bug in the snippet creation where it does not always show cluster contents properly, and that's what happened here. The array constant wired to the left side of the lower shift register contains a cluster containing an array of numeric values. You will see this if you load the snippet. I hope that you were able to understand the logic of this code as you were constructing it, but if not, please ask for an explanation.
From there it is trivial to find the max and averages. Connect the output of my code to a for loop. Inside the for loop, unbundle the array, and compute the maximum and average. Functions to do these operations on any numeric array already exist (look for Array Max & Min, and Mean).

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