How to use switch statement with list box?

Hi! :)

Please see the attached code.

What I dont understand is what I have done wrong here . I think the code runs when I dont click cancel on the listbox but when I choose cancel from the listbox, I get error.

Have I done something wrong writing if statement within otherwise and using empty as an option there..?

Please run the code with for instance samlet_akivitet=0.5 and temperature =30 ;

Thanks

Answer 1

[Walter Roberson]

When you ask to cancel then indx is empty, []. The empty matrix is not considered to be a scalar -- a scalar is 1 x 1 but [] is 0 x 0. And when you ask to switch on something, you need to switch on a scalar or on a character vector

You need to re-order your code. After the listdlg() test

if ~tf
        osmotic_pressure= [];
        disp('You have not chosen any value for ME.')
        error_osm=1;
        return
end

Now you can switch() indx and be certain that indx is a scalar.