What is the difference between if-else block and a switch block in simulink?

Can anyone explain the difference between if-else block and switch block in simulink?

Answer 1

[Azzi Abdelmalek]

1. The switch block has 2 input signals and a third input (in the middle of the block) that indicate if the first or second signal will pass through the block. It'd the only action you can do, choosing between signal1 or signal2
2. With If-Else block, when the condition is true, you can run any action you want

[chethan]

My confusion lies here. Both switch block and If-else block works in the same way, where the output depends on the control parameter.

In which situation do i use switch block and If-else block?

Please explain with a situation where i can differentiate the use of these two.

[Matthias Seibold]

switch block:

the switch block in simulink is analogous to an if-else statement in matlab. you can can just switch between 2(!!) signals. therefore you choose your criteria to switch between the signals.

if block:

the if block does mostly the same. the difference is that you can add more elseif expressions, so you can include more possibilities than 2.

[chethan]

Now can you explain the difference between multiport switch block and if else block?

Answer 2

[Matthias Seibold]

switch block:

the switch block in simulink is analogous to an if-else statement in matlab. you can can just switch between 2(!!) signals. therefore you choose your criteria to switch between the signals.

if block:

the if block does mostly the same. the difference is that you can add more elseif expressions, so it can include more possibilities than 2.

Answer 3

[Matthias Seibold]

the multiport switch represents the switch-case statement. You just define different cases and the block activates the port of the true statement.

switch var
case 3
    a = 10;
case 2 
    a = 20;
end

the if-else block does the same once again. the different options are set by elseif conditions. it represents a statement like:

if var > 3
    a = 2;
elseif 0 < var =< 3
    a = 1;
else
    a = 0;
end

as you can see, you can define ranges for the variables in the if-else statement (if-block) that you cant realize with an switch-case statement (multiport switch block)

Does this answer your question?

[Ronnabel Sernicula]

How to input this in simulink?

[Gabriel Sobola]

Kindly look for the if-else block or switch block in the Simulink Library, and implement the statement above.

Answer 4

[Gabriel Sobola]

The if-else and the switch blocks are similar to if-else and switch case statements in Matlab script.

Both perform the same function when the input conditions/signals are two (just like in script).

For instance, if you want to decide between two conditions, you can use either of the blocks in Simulink, but if the conditions are more than two, if-else block is the prefered option.