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Hi there,

unfortunately I don't have a solution to the problem, I just experienced the same issues as you guys.

So I decided to implement a DFT on my own and I think I may found the issue of the realFFT example.

Have a look at the following basic example I implemented:

#### Code:

block DFT

import Modelica.Constants.pi;

parameter Integer N = 360 "Total number of samples";

Integer iTick;//(start=0, fixed=true);

Real y_buf[N];//(start=vector([6.5; fill(0, N - 1)]),each fixed=true);

algorithm

when sample(0, 0.1) then

iTick :=iTick + 1;

if iTick >= 1 and iTick <= N then

y_buf[iTick] := iTick;

end if;

end when;

end DFT;

I copied some parts of the realFFT example to sample a simple sine function but it didn't work! No values were written into the y_buf array.

So tried to simply assign the value of "iTick" to the buffer array but it still doesn't work..

My guess is that it has something to do with the when environment together with the sample() function because the following example works fine:

#### Code:

block DFT

import Modelica.Constants.pi;

parameter Integer N = 360 "Total number of samples";

//Integer iTick;//(start=0, fixed=true);

Real y_buf[N];//(start=vector([6.5; fill(0, N - 1)]),each fixed=true);

algorithm

for i in 1:N loop

y_buf[i] := i;

end for;

end DFT;

So if anyone has an idea why the first example doesn't work but the second does it would be a great help for my work!

Hopefully I can contribute with this post to motivate the discussion about these issues.

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