Scattered data interpolation simulink

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Joel Lapointe
Joel Lapointe 2018-1-19
评论： Dave Hall 2022-7-27
Hi,
I tried to use a lookup table in a simulink project. However my data is not monotonically increasing. So it gave me errors for breakpoints. It is not very clear how to implement lookup a table for scattered data (1 dependant + 2 independant variables).
So I reverted to put a MATLAB function block to use scatteredInterpolant() in the function. It worked when I put it in a matlab script but not in a simulink MATLAB function. Here is the error for the simulink:
%code
Undefined function or variable 'scatteredInterpolant'.
Function 'MATLAB Function' (#36.1523.1572), line 34, column 15:
"scatteredInterpolant(P_ent_mod,D_ent_mod,E_s_mod)"
Launch diagnostic report.
I want to specify that scatteredInterpolant worked well in a script but not in the simulink function block
My scattered model data are 3 .txt files which I import in the workspace in 3 column variables (no time dependency).
My questions are:
- How to do a lookup table for scattered data from 3 variables (no time dependancy and not monotonically increasing)?
- How to use the scatteredInterpolant() in a simulink MATLAB function block?
- Is ther other alternative to do interpolation in simulink than lookup tables with scattered data?
Thank you very much,
Joel Lapointe
  1 个评论
Christopher Dadswell
Christopher Dadswell 2018-2-15
Hi Joel,
Did you find a solution to this? Currently having a similar issue.
many thanks, Chris

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回答（1 个）

yang xiang
yang xiang 2019-3-5
write a script like this and execute:
a=xlsread('data.xlsx');
x=a(:,1);
y=a(:,2);
z=a(:,3);
F=scatteredInterpolant(x,y,z);
save('inp.mat','F');
then mask the block in simulink and add
load('inp.mat')
in the initialization tab.
at last, use interpreted matlab function block in simulink. use matlab funtion like this:
F(u(1),u(2))
I hope this helps you.
  2 个评论
Dave Hall
Dave Hall 2022-7-27
I see the "scatteredInterpolant" "inp" in my 'inp.mat' file, and I get no errors from the initialization command in my mask, but I get the error "Undefined function or variable 'inp'". Any ideas?
Dave Hall
Dave Hall 2022-7-27
Ah, nevermind. I wasn't using the interpreted matlab function block. Now it works.

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