Simulink - How to create a conditional "if" block with more than 3 conditions?

Question

Katarina Vuckovic 2019-9-18

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/480948-simulink-how-to-create-a-conditional-if-block-with-more-than-3-conditions

评论： Nachiket Bapat 2021-2-23

采纳的回答： David K.

Simulink - How do I create a conditional "if" block with more than 3 statements?

For example:

if(a>2)

do something

elseif (b>3)

do something else

elseif (c>4)

do something else

elseif (a<2 and c<2)

do something else

else

do default

end

What have I tried so far:

The default "if" block permits only 2 conditions + default.
I tried using the "case" but case only take one input and I need multiple inputs and 1 output (different depending on the conditions).

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Nom 2019-9-18

编辑：Nom 2019-9-18

在 MATLAB Online 中打开

I'm running the script and it seems to be running fine for me.

a = 1;
b = 1;
c = 1;
if(a>2)
    disp('first');
elseif (b>3)
    disp('second');
elseif (c>4)
    disp('third');
elseif (a<2 && c<2)
    disp('fourth');
else 
    disp('default');
end 

The issue I think you're facing is once a statement is true (e.g. if b is greater than 3, hence second if statement is correct). The program will exit the if statement and not check if a<2 && c<2.

One way to solve this issue (may not be the best but it should work) is just dividing the if statements into seperate statements instead of creating multiple elseifs.

Katarina Vuckovic 2019-9-18