block SyncFilter

  parameter Real UpdateRate = 25000.0;

  parameter Integer n = 5;

  extends Modelica.Blocks.Interfaces.DiscreteSISO(samplePeriod = 1.0 / (n * UpdateRate));

  output Real x[n - 1] "State of transfer function from controller canonical form";

  

  Real b[n] = ones(n) / (1.0 * n);

  Real xext[n];

  Real x1;

  

equation 

  when sampleTrigger then

      x1 = u;

    xext = vector([x1;x]);

    x = xext[1:size(x, 1)];

    y = vector([b]) * xext;

  

  end when;

end SyncFilter;

"Error: Wrong type or wrong number of arguments to vector([b])'.