Look up Table

[KevC]

Hi everyone.

I am trying to implement several look up tables.

I want to have analogue input values, such as (-0.33 0.47 1.67), and produce output values such as (1 0 0).

I was looking at the 1D LUTs, but they seem to work on indicies, which is not suitable in my case.

There will be quite a bit of repetion in my code, so if anyone has a simple way to impplement this it would be greatly appreciated.

Regards

Kevin

[TiTou]

Would the interpolate 1D array do the job ?

[KevC]

Thanks for the reply.

I don't think this will work.

I need something that when it receives a certain value, outputs a value. The inputs and outputs are not related in any way.

[TiTou]

This is what I was meaning, is that what you need ??

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Message Edité par TiTou le 03-14-2006 03:25 PM

Message Edité par TiTou le 03-14-2006 03:26 PM

[JeanPierre]

If the inputs and outputs are not related in any way, I don't know how we can help you to create a suitable algorithm...
Can you be more specific? When the question is well written, the problem is already half solved.

[TiTou]

Kevin,

As JeanPierre said... it is not easy for us to give you good advice if we have so few informations about your apps...
for instance, could you post a part of your code ?

[KevC]

Hello.

Sorry for the vagueness.

What I mean is that it is not case of a relationship between the input and the output, if you like, it is not linear, proportional etc.

It is a case of a certain value of input gives a certain value at the output.

I don't really have any code that I can show you to make this clearer.

Thanks guys

[smercurio_fc]

OK... Based on the previous responses I still don't see why the Interpolate 1D Array function, potentially coupled with the Threshold function wouldn't work for you. I mean, you're doing a simple lookup, right? Based on your sample arrays what should the output be if the input is, say -1? Or 43.55? Or 0.01?

[TiTou]

Kevin,

Is this what you need ? Obtaining a certain corresponding value pre.-entered in the LUT...

[smercurio_fc]

Unfortunately, that VI won't work since you're trying to perform an equality test on a floating point and that's an exercise in futility. You will need to perform a "basically equal to" test - in other words is the value equal to another value within a certain range.