How to find lowest 5% value from 1D array?

[Hk637]

Hi Guys,

I have a set 1D of array with array size of 60. 

I sorted them and now need to know the top and bottom 5% value.

Suppose, the 1D array:

0.0006

0.0056

0.5

0.57

0.73

1.67

3.56

10.45

11.32

13.45

I need to divide this array into 3 sections: mean value, top 5% and bottom 5% value. 

Can anyone gude me to do it? 

[altenbach]

You posted a simple mathematical questions in a LabVIEW forum. Do you know the math and have trouble implementing it in LabVIEW? Do you have problem with the math itself?

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@Hk637 wrote:

I need to divide this array into 3 sections: mean value, top 5% and bottom 5% value. 

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If you have 60 points, each point is ~1.67% of all points.  So how many points would be 5%?

The mean value is a scalar, not a "section". Can you explain the terminology and what you mean by "divide the array"? Obviously this is not a mathematical division, but a splitting.

[jcosta1]

Hi, as altenbach mentioned, it is just a mathematical problem, but here is an example of how it could be done in case you still have doubts.

I would like to comment that depending on whether you are looking for exactly 5% or rounding, you should use an "absolute value" or not.

Best regards, a beginner in LabVIEW (2018, 2020, 2021)

[GerdW]

Hi jcosta,

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@jcosta1 wrote:

here is an example of how it could be done in case you still have doubts.

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You know your two FOR loops do just the same as an ordinary ArraySubset function?

And you could also replace the whole ReverseArray+FOR+ReverseArray by a simple DeleteFromArray function?

[jcosta1]

Hi, that was my mistake, it really is much simpler and more efficient that way. Thank you very much for the correction and teaching.

Best regards.

A beginner in LabVIEW using LV2018/2020/2021

[Yamaeda]

The compiler probably is smart enough to do this optimization for you, but instead of multiplying with 5 and dividing with 100 you can just multiply with 0.05.

[Minions]

Again, the title and initial information does not give a clear enough message as to what the OP is actually requesting.  I looked at the data as all values that are within 5% of the Min-Max values.

       

[alexderjuengere]

I would use the built in percentile .vi

you can even look at the .vis blockdiagram and it is completly written in G...

[alexderjuengere]

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20 to 80	5 to 95

attached as labview 2020