How to create a random number as i asked below.

Hello everyone here is my question;

i want to create a random number with 4 number of digits but it needs some speciality.I mean 1 number shouldnt repeat again.For example

2222 is wrong 1234 is correct.

it supposed to be between 1000 and 9999 and user should guess the number for example again lets say our number is; 1234 if i guess 1235 program should output +++- or if i wrote 2234 program should -++-.

Thanks for helps.

Answer 1

[dpb]

doc randperm

[serkan yassikaya]

randperm(k,n) does not work on my pc it gives error only accepts randperm(k)

[James Tursa]

x = randperm(k);
x = x(1:n);

[Salaheddin Hosseinzadeh]

I like James solution, it's easy. Just keep K as 9 and be aware that you probably wont have a 0 in your digits. You also don't want any repeated digits so, your smallest value will be 1234, up to 9876.

[James Tursa]

If you want the 0 possibility but not begin with 0, here are two solutions:

% Only one randperm call but solution not quite uniform distribution
x = randperm(10) - 1;
if( x(1) )
    x = x(1:4);
else
    x = x(2:5);
end

% Slightly more randperm calls on average, solution is uniform
x = 0;
while( x(1) == 0 )
    x = randperm(10) - 1;
end
x = x(1:4);

Answer 2

[serkan yassikaya]

now i have this problem when im determining the equality of digits system gives answer with logical like; 0000 or 0101 but it should bt ++++ and ---- 's how may i change this setup.

Btw thanks a lot for your helps.

[James Tursa]

Assuming 0 means incorrect (-) and 1 means correct (+), e.g.,

% Test data
g = logical([0 1 0 1]);

mp= '-+';
s = mp(g+1);

[serkan yassikaya]

Thanks so much made my day! great persons you are.

[serkan yassikaya]

display('Tahmininizi yaptığınızda eğer doğru ise + yanlıs ise - alacaksınız!')

display('Eğer çok sıkılırsanız veya bulamaz ve sinirlenirseniz lütfen "game over" yazınız:)')

x = 0; while( x(1) == 0 ); x = randperm(10) - 1; end x = x(1:4);

a = x(1:1); b = x(2:2); c = x(3:3); d = x(4:4);

A = [a, b, c, d,]

prompt = 'Bir tahminde bulunun lütfen.';

H = input(prompt);

e = H/1000; e = floor(e); %binler basamağı buradan çıkar. r = H - e * 1000; r = r / 100; r = floor(r); % yüzler basamağı buradan çıkar. t = H-e*1000-r*100; t = t / 10; t = floor(t); y = H-e*1000-r*100-t*10; y = y / 1 ; y = floor(y); %onlar basamağı burdan çıkar.

J = [e,r,t,y,]

g = logical([0 1 0 1]); mp= '-+'; s = mp(g+1);

A == J

[serkan yassikaya]

still gives answers logical..