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

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chethan 2014-9-4

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评论： Gabriel Sobola 2021-12-4

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

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Answer 1

Azzi Abdelmalek 2014-9-4

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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
With If-Else block, when the condition is true, you can run any action you want

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Matthias Seibold 2014-9-4

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 2014-9-4

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

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Answer 2

Matthias Seibold 2014-9-4

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编辑：Matthias Seibold 2014-9-4

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.

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Answer 3

Matthias Seibold 2014-9-4

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在 MATLAB Online 中打开

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?

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Ronnabel Sernicula 2021-5-22

How to input this in simulink?

Gabriel Sobola 2021-12-4

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

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Answer 4

Gabriel Sobola 2021-12-4

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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.