isletter true false

How does isletter work here. Is it the value 1 that makes it executable and the value 0 that makes it not excecute and go to else?

http://bildr.no/view/1001050

Answer 1

[per isakson]

isletter is a function, which returns a logical value. The logical values, true and false, are displayed as 1 and 0, respectively by Matlab. Test by running

class( isletter('a'))

Thus, you may read "if true" execute the if-clause else execute the else-clause.

Answer 2

[Wayne King]

I don't see isletter() in what you've posted. I see an if statement based on the output of menu()

The menu() call you show outputs a 1,2,or 3 based on what the user selects. 1 for Cheese, 2 for Shroom, and 3 for Sausage.

If the user were to simply kill the figure window, then output would be 0.

[the cyclist]

Wayne, you need to scroll down a bit to see the relevant section he is asking about.

[Wayne King]

@cyclist, :) oh I see

Answer 3

[the cyclist]

Basically, yes. "1" is a representation of the boolean "true", and "0" is a representation of the boolean "false". So, "if 1" means "if true", and the statement executes accordingly.

[Tor Fredrik Hove]

thank you for alll ansers all were great!