clarification of the use 'switch case'

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

Answer 1

[Amith Kamath]

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!

[Jan]

The meta message of this answer: Reading the documentation is strongly recommended: "help switch", "doc switch", "docsearch switch"...

[Amith Kamath]

I wonder why that's not so obvious, considering the number of such questions here!

[Scragmore]

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