write a function to return next value each time only nonzeros

Hi

I want to write a function to return the value of gmax_gholhak each time there are some numbers i.e 0 45 0 0 0 75 and I want to return only nonzeros value in each time i call the function first time 45 second 75 and ....... .but it return all data in the array regardless the condition in if and also zeros in it . and also when i write my code like this in if statement " gmax_gholhak" (without i ) it only returns the last value.

I also use nonzeros but it didn't help neither

can you help me , Thank you very much

function  [gmax_gholhak] = Gmax_gh(k)



gholhak_gmin = readtable('gholhak_gmin.xlsx');
gholhak_queue = readtable('gholhak_queue.xlsx');
mir_gmin = readtable('mir_gmin.xlsx');
mir_queue = readtable('mir_queue.xlsx');


gholhak_period_down =gholhak_gmin.begin(17:end,1);
gholhak_car_number_min = gholhak_gmin.nVehContrib(17:end,:);

gholhak_period_up =gholhak_queue.begin(17:end,1);
gholhak_car_number_queue = gholhak_queue.nVehContrib(17:end,:);

mirdamad_period_up =mir_queue.begin(17:end,1);
mir_car_number_queue = mir_queue.nVehContrib(17:end,:);

mir_period_down =mir_gmin.begin(17:end,1);
mir_car_number_min = mir_gmin.nVehContrib(17:end,:);



%% Calculate Green time min-max

N = length(gholhak_car_number_queue)/2;
for i = 1:1:N
    gmin_gholhak = 0;
    if gholhak_car_number_queue(2*i-1) + gholhak_car_number_queue(2*i) ==0
        gmax_gholhak(i) =(gholhak_period_up(2*i-1) + gholhak_period_up(2*i))/2;
    end
end
end

Answer 1

[Jonas]

if I understand correctly you want the function the be able to remember how often the function was called. each time the next non-zero element is the output

a brief implementation could look like this:

array=[1 0 0 2 0 0 3 0 0 0 4 5 0 0];

getNextNonzero(array)

ans = 1

getNextNonzero(array)

ans = 2

getNextNonzero(array)

ans = 3

getNextNonzero(array)

ans = 4

getNextNonzero(array)

ans = 5

getNextNonzero(array)

no element left

ans = NaN

function out=getNextNonzero(array)
array=array(array~=0);

 persistent idx;
 if isempty(idx);
     idx=1;
 elseif idx<numel(array)
     idx=idx+1;
 else
     disp('no element left');
     out=NaN;
     return;
 end
 
 
 
 out=array(idx);

end