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Jacobian evaluation argument of realdot must be 0, 1, or -1

Posted 2021年3月3日 GMT+1 08:29MEMS & Nanotechnology, RF & Microwave Engineering, Wave OpticsVersion 5.51 Reply

Amartya Das Das
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Hello I am a new comsol user 5.5 While analysing the photonics crystal I am facing "Jacobian evaluation argument of realdot must be 0, 1, or -1"

It would be nice if you can help me.

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1 Reply Last Post 2021年3月3日 GMT+1 15:06
Magnus Ringh COMSOL Employee

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Posted: 4 years ago 2021年3月3日 GMT+1 15:06

Hi Amartya,

This error occurs because you are using the optional third argument to therealdotoperator in in an unintended way. From the COMSOL Multiphysics documentation:

realdot(a,b,jaclevel)

Thejaclevelargument controls Jacobian contributions of therealdot(a,b)operator and can have the following values:

  • −1: (default) Jacobian contributions in the assembling only if splitting of complex variables in real and imaginary part is active for the Study
  • 0: no Jacobian contributions
  • 1: always Jacobian contributions

In your model, you have defined the variablenEzasintop1(realdot(emw.Ez,emw.Ez,emw.Ez))/A, which is an incorrect use of the syntax with three input arguments.

Best regards,

Magnus Ringh

Hi Amartya, This error occurs because you are using the optional third argument to the `realdot` operator in in an unintended way. From the COMSOL Multiphysics documentation: `realdot(a,b,jaclevel)` The `jaclevel` argument controls Jacobian contributions of the `realdot(a,b)` operator and can have the following values: * −1: (default) Jacobian contributions in the assembling only if splitting of complex variables in real and imaginary part is active for the Study * 0: no Jacobian contributions * 1: always Jacobian contributions In your model, you have defined the variable `nEz` as `intop1(realdot(emw.Ez,emw.Ez,emw.Ez))/A`, which is an incorrect use of the syntax with three input arguments. Best regards, Magnus Ringh

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