Selecting a random digit from a vector except for one digit that should not show except when at least 5 of the other digits were shown

Using AppDesginer, I want to show one digit at a time on the screen (a I created a vector from 0 to 9) and let's say I want the last number to only show when at least other 5 digits from the vector were shown before it. Can you please help me?

Answer 1

[Walter Roberson]

min_before = 5;
lb = 0; ub = 9;
candidates = lb:ub;
special = randi([lb ub]);
not_special = setdiff(candidates, special);
order1 = randperm(length(not_special), min_before);
first_group = not_special(order1);
remainder = [special, setdiff(not_special, first_group)];
order2 = randperm(length(remainder));
second_group = remainder(order2);
order = [order1 order2];

[Dana Cherri]

That's great! but how can i code that exactly for example the number 3 is the digit to be separated from the other by minimum 5 times?

[Walter Roberson]

That is the variable named special . You can set it to a constant if that is appropriate for your work.

The code can be optimized for the case that you have only 0 to 9 and that 3 is always the special value.

[Dana Cherri]

It is showing "Invalid default value for property 'candidates' in class 'app1':

Undefined function or variable 'lb' " although I referred to the class name.

This is the code:

classdef app1 < matlab.apps.AppBase

properties (Access = private)

Property % Description

min_before = 5;

lb = 0;

ub = 9;

candidates = lb:ub;

special = 3;

not_special = setdiff(candidates, special);

order1 = randperm(length(not_special), min_before);

first_group = not_special(order1);

remainder = [special, setdiff(not_special, first_group)];

order2 = randperm(length(remainder));

second_group = remainder(order2);

order = [order1 order2];

font = [48 72 94 100 120];

height = 12:29;

end

% Callbacks that handle component events

methods (Access = private)

% Button pushed function: ReadyButton

function ReadyButtonPushed(app, event)

app.ReadyButton.Visible = 'off';

app.HelloLabel.Text = 'Hello';

app.HelloLabel.FontColor = [1 1 1];

pause(1);

for ii = 1:160

tstart = tic;

app.HelloLabel.Text = app.order(ii);

pause(0.25);

app.HelloLabel.Text = 'X';

pause(0.9);

app.HelloLabel.Text = app.order(ii);

telapsed = toc(tstart);

end

end

[Walter Roberson]

Most of the code belongs in a method, not in a property definition.