# How to implement Hermite spline in Simulink

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MARCO LORENZI 2021년 9월 22일
편집: MARCO LORENZI 2021년 9월 24일
Good morning everyone.
Can i ask if it there is a way to implement the Hermite spline (pchip) or Bezier curves in simulink?
In particular, i am using a look-up table to interpolate a curve between some point, but the cubic and akima splines don't do a good job. I was thinking about using a linear interpolating method and then smoothen up the curves, but i can't find any blockset.
Thank you very much in advance.

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### 채택된 답변

Bjorn Gustavsson 2021년 9월 22일
There is a way to make blocks that wrap a matlab-function (matlab-functions-simulink_5), shouldn't that solve this task?
HTH
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Bjorn Gustavsson 2021년 9월 24일
To me it seems as you swapped the x and xq in the function. It ought to be:
function output = low_angles_Hermite_approximation(phase)
xq = phase;
y = [0 0 0 0 0 0 0 1 1];
x = [0 2.5 5 7.5 10 13 15 30 90];
output = pchip(x,y,xq);
When you program and run into errors like these read the help and documentation carefully - and calmly, far to often it is easy to rush that part. Also be prepared to use the debug-facilities of matlab, I typically turn on debug-stop after an error:
>> dbstop if error
Then you get a command-line prompt at the line where the error occurred with command-line access to all variables in the function and it is possible to step up in the function call-stack.

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