Continuously update variable in function

Hi Guys, CODE BELOW

I have a function where I have the variable coun, coun is calculated

I then have a function which runs that function multiple times for a given number.

What I would like to do is run the function twice, so lets say i run it first time and then get coun = -1 i want to then use that value of coun and not start again at zero. Could someone please help me with this, thanks Steven.

CODE BELOW for calculation of count.

function [x,money] = winnings4(x)

i0 = (randi(length(x)));
j0 = (randi(length(x)));
k0 = (randi(length(x)));

while j0==i0 
    j0 = (randi(length(x)));
end

while k0==j0 
    while k0==i0
    k0 = (randi(length(x)));
    end
    if k0==j0
    k0 = (randi(length(x)));
    end 
end

PlayersHand = [x(i0),x(j0)]
DealersHand = [x(k0)]
a = x(i0)
b = x(j0)
c = x(k0)

coun = 0;

if a < 7 && a >= 2
    coun = coun + 1
end

if a < 10 && a > 6
    coun = coun + 0
end

if a == 10
    coun = coun - 1
end

if a == 1
    coun = coun - 1
end

if b < 7 && b > 2
    coun = coun + 1
end

if b < 10 && b > 6
    coun = coun + 0
end

if b == 10
    coun = coun - 1
end

if b == 1
    coun = coun - 1
end

if c < 7 && c > 2
    coun = coun + 1
end

if c < 10 && c > 6
    coun = coun + 0
end

if c == 10
    coun = coun - 1
end

if c == 1
    coun = coun - 1
end

x(i0) = 0;
x(j0) = 0;
x(k0) = 0; 
x = x(x~=0)

%%----------------------------------------CODE FOR FUNCTION TO RUN ABOVE MULTIPLE TIMES BELOW:----------------------%%
function run4 = m()

v = [1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,6,6,6,6,7,7,7,7,8,8,8,8,9,9,9,9,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10]; 
deck = [v,v,v,v,v,v]; % 6 decks
y = zeros(1,100);

for k = 1:2 
[deck,y(k)] = winnings4(deck);
if length(deck) < 78 
run4 = sum(y); 
p = length(deck); 
q = k; 
return
end

end
run4 = sum(y);

end 

Answer 1

[darova]

Try persistent

[Steven Strange]

hi,

I am quite new to MATLAB, what do you mean by persistent?

thanks, Steven

[darova]

I mean that variable you declared as persistent is not removed after function calling

function main
    func
    func
end

function func
    persistent a
    if isempty(a)
        a = 1;
    end
    a = a + 1
end

To clear variables (these lines should be outside outside the function (command window or script))

clear functions

[Steven Strange]

hi, this does not carry through my value of coun.

My problem is, if the function is ran multiple times the value of coun starts again at = 0, i dont want this, i want the value of coun to start off at whatever it was in the previous run.

For exampe

if coun = 5

the next run should start with coun = 5 NOT 0.

Hope this helps. Steven.

[Ameer Hamza]

You need to declare your variable coun as persistent. Replace the following line in your function

coun = 0;

with

persistent coun
if isempty(coun)
    coun = 0;
end

[darova]

I made a simple scheme for you. Please see it and try to understand

[Steven Strange]

hi, that works! thank you so much Ameer and Darova