Hello,

I have a question regarding the difference between fill(-a,N) and -fill(a, N).

If I have the following model

model Test

  parameter Integer N = 1;

  Real a[N];

  Real b[N];

equation    

  a = fill(-1, N);

  b = -fill(1, N);

end Test;

the flattend code is the following:

class Test

  parameter Integer N = 1;

  Real a[1];

  Real b[1];

equation

  a[1] = -1.0;

  b[1] = DAE.CAST(/tp:T_REAL[1]/, -{1})[1];

end Test;

This appears more or less equal to me, however, I have a more complex model where using fill(-1,N) simulates correctly and -fill(1,N) leads to a simulation error.

warning | Error solving nonlinear system SES_ALGORITHM 0 at time 0

In my opinion the two solutions should be equal.

Best regards,

Michael