Switch Case

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Switch Case

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switch variable

 case variable1 do


 case variable2 do


 default do





 z = 4;

 i = floor(time);

 switch i

         case 1 do

                 y = 1;

         case 2 do

                 y = 2;

         case 3 do

                 y = 3;

         case z do

                 y = 4;

         default do

                 y = 5;



The switch case statement is designed to execute equation(s) based on the value of a variable. Only the equations of the valid branch are executed. If non of the branches is valid, the equations of the default branch are executed.


1.The switch variable should not be changed inside one of the branches.
2.Equations within a switch case statement have to be written in the correct order of execution, i.e. they are not rewritten into a causal form but executed sequentially. Therefore it is advised only to use this statement in a code section.


1.Keep the condition variables (variable1, varable2) constant during simulation to prevent confusion.
2.Make sure that the switch variable has the right value to execute the branch. In the example, the time variable changes value every time step. The floor function is used to keep it at a constant value long enough to see the branches in action.