# LabVIEW

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## normalise array to values between 0 and 1?

Is there are .vi in labview that will allow me to normalise an array of data to values that are between 0 and 1? if not, does anyone know the calculation that will allow me to do this?

Message 1 of 8
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## Re: normalise array to values between 0 and 1?

ok nvm, worked it out. its a + (x-A)*(b-a)/(B-A) where:

A minimum of dataset

B maximum of dataset

a is from where you would like normalised data set to start

b is where you would like normalised data set to end

x is the value you are trying to normalise

found it at this website http://www.howcast.com/videos/359111-How-To-Normalize-Data

Message 2 of 8
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## Re: normalise array to values between 0 and 1?

Hi LVStudent,

To normalize a waveform you can run a search for "Normalize Waveform.vi" or in the function palette-->Programming-->Waveform-->Analog Waveform--> Normalize.

Hope it'll let you avoid implementing this: a + (x-A)*(b-a)/(B-A).

Message 3 of 8
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## Re: normalise array to values between 0 and 1?

Firstly, normalize waveform will scale a waveform to [-1..1] and not [0..1] and the OP asked for an array operation, not a waveform operation. Both are incorrect answers.

Here's how you would scale an array from 0..1. If you want, you can turn this into a subVI.

Message 4 of 8
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## Re: normalise array to values between 0 and 1?

On a side note, I wish NI would get their terminology straight here. For example:

1. Normalize waveform: scales a waveform from -1..1
2. Normalize VI: normalizes an array so the statistical profile has a mean of 0 and SD of 1.
3. Scale VI: scales an array from -1..1.
4. Waveform scale and offset: Does again something entirely different.... equivalent to linear evaluation!
1 and 2 are very different, but have similar names.
1 and 3 do basically the same, but have different names....
etc.
sigh!

Message 5 of 8
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## Re: normalise array to values between 0 and 1?

After you posted your first response, I looked up the algorithms/formulas in use and 1&2  are, indeed, very different.

How innocent of me to think that they are all the same....

From my experience, which isn't much, we use #2 and not/never [-1...1], but I guess it depends on the application/discipline.

Message 6 of 8
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## Re: normalise array to values between 0 and 1?

Just remember that this code assumes that all values in the array are positive. If your signal fluctuates below zero this will not work.

Message 7 of 8
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