Way to determine Look-up table values from input/output data

Question

Matt Lawson 2012-1-26

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https://ww2.mathworks.cn/matlabcentral/answers/27157-way-to-determine-look-up-table-values-from-input-output-data

Here's what I'm trying to do:

I have 3 Look-up tables in series in a Simulink model. I would like to replace with a single look-up table.

I see that I can determine lookup tables parameters from input/output data using the Simulink Design Optimization Toolbox (which I do not have here, unfortunately, but have lots of other toolboxes). Is there any other method I could use?

Thanks in advance for any help,

-Matt Lawson

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Answer 1

Kaustubha Govind 2012-1-26

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https://ww2.mathworks.cn/matlabcentral/answers/27157-way-to-determine-look-up-table-values-from-input-output-data#answer_35346

The Curve Fitting Toolbox is ideal for this sort of thing, but I've also used the fixpt_look1_func_approx utility to achieve the same sort of thing before. (I can't speak for which might be a better option)

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Matt Lawson 2012-1-26

Hi Kaustubha,

I looked at fixpt_look1_func_approx and you need to specify the f(x) which I don't have, not sure how I could use that.

I'm looking at the Curve Fitting Toolbox, hopefully will find a function that will work there. Any recommendations? Thanks.

Kaustubha Govind 2012-1-26

Ah! You're right - it's been a while since I used that function. I haven't used the Curve Fitting Toolbox, so can't offer much useful advice there. But I just remembered about the polyfit function - it does Polynomial curve fitting.

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