How can i set the Simulink lookup table output limit

Question

환곤 2023-1-6

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1889372-how-can-i-set-the-simulink-lookup-table-output-limit

回答： Nehemiae 2023-3-8

i want to get data from 1-D Lookup table in simulink with includeing extrapolation method and only plus side.

but i don't know how can this.

Ex)

1) LUT Data

X : [0.7, 0.8, 0.9, 1, 1.1]

V : 1.5, 1.4, 1.3, 1.2, 1.1]

2) Data INPUT and result (Current)

2-1) INPUT : 1 --> OUTPUT : 1.3

2-2) INPUT : 16 --> OUTPUT : -~~~ (Extrapolation method)

if Extrapolation method result is lessthen zero, I want to get result 0.

2-3) INPUT : 0.2 --> OUTPUT ; +~~~(Extrapolation method)

i was tryied Data Types - Output Minimum and Maximum Seting but that is not working. (Using verstion is 2015b)

Please letme know this solution.

4 个评论
显示 2更早的评论隐藏 2更早的评论

Nithin 2023-1-13

What problem are you exactly facing with the parameters? Are you receiving any error messages?

환곤 2023-1-16

I tried setting "Table Data Maximun" and "Table Data Minimum" parameters.

Like below picture

And goto some values in Lookuptable, dosen't working "Maximum","Minimum" parameter.

LUT is working and nothing error. but can't applying parameters.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Nehemiae 2023-3-8

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1889372-how-can-i-set-the-simulink-lookup-table-output-limit#answer_1188170

Hello,

The Output Minimum and Maximum properties in the 1-D lookup table, are the information stored for further optimizations done, such as:

Parameter range checking.
Simulation range checking.
Automatic scaling of fixed-point data types.
Optimization of the code generated from the model.

It does not limit the output of the lookup table as such, and hence a saturation block with upper limit being inf and the lower limit being 0, can be used.

The documentation on 1-D lookup tables (https://www.mathworks.com/help//releases/R2021a/simulink/slref/1dlookuptable.html), specifically the section under “Output Minimum – Minimum value the block can output”, can be explored to understand the underlying optimisations where this property is used.