clarification of the use 'switch case'

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Scragmore
Scragmore 2011-12-4
Hi,
I would just like a little clarification of the use of 'switch case', most of the examples I have looked at showed examples where only one of the 'case' are true. I have not found an explanation that makes it clear I can return any number of true or positive values.
My example, I have a number and want to ask 5 questions and execute code/function at all true values. All questions may be true, false or any combination in between.
switch 25
case >20
do a
case mod(3)
do b
case ==5^2
do c
end
Does the code execute every 'case' irrelevant of previous answer, if so do I use break or continue to exit the switch.
Regards,
AD

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回答（1 个）

Amith Kamath
Amith Kamath 2011-12-4
from http://www.mathworks.com/help/techdoc/ref/switch.html,
In MATLAB switch blocks, only the first matching case executes:
result = 52;
switch(result)
case 52
disp('result is 52')
case {52, 78}
disp('result is 52 or 78')
end
This code returns
result is 52
Hope this clarifies your questions!
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Amith Kamath
Amith Kamath 2011-12-4
I wonder why that's not so obvious, considering the number of such questions here!
Scragmore
Scragmore 2011-12-4
Ok,
So it only executes the first true answer before exiting the 'switch case' statement. So to perform a number of queries on a variable and execute each time a true statement is returned I would have to write successive 'if end' statements.
x = 25;
if x > 20
do a;
end
if mod(x,n)
do b;
end
if x == 5^2
do c;
end
...
Sorry this was not 100% clear when I read those docs which was why I requested clarification. Or hoping someone would direct me to an alternative function that may have been more suitable.
Thanks,
AD

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