demo_choose create a dialog box for the choice of options

## Syntax

    num = demo_choose(fil)

## Arguments

fil

  String containing the path of the binary file.

num

  a number of the selected line.

## Description

The function demo_choose create a dialog box for the choice of options. It takes as argument the binary file 'fil'. It shall contain the variables 'choice', an array of text within bracket (the different options), and 'titl', the title of the dialog box. The function demo_choose returns the number of line chosen in the options array.

## Examples

    choice = ['Continuous time';'Discrete time'];
    titl = 'Select time domain';
    save(fullfile(TMPDIR, "example.bin"));
    [n]=demo_choose(fullfile(TMPDIR, "example.bin"));
    select n
      case 0
        disp("Cancel")
      case 1
        disp("Choice: 1")
      case 2
        disp("Choice: 2")
    end

## See also

- x_choose