i want to create an array (like Profit(n1) and Sale(n1)), when push button is pressed, but the problem is when button is pressed only current value is store at 'n1' but the previous values remove from array and become zero. plz help in this regard..

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ALI IQBAL 2019-1-5

function PB1_Callback(hObject, eventdata, handles)

% hObject handle to PB1 (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

clc;

handles.counter = handles.counter + 1; % Counter

n1 = handles.counter;

% get the string data from the three edit controls

str1 = str2num(get(handles.ET2,'String')); % Code

str2 = str2num(get(handles.ET3,'String')); % Price

str3 = str2num(get(handles.ET4,'String')); % Count

% do some work

Profit(n1) = (str2 - (str1 - 203)) * str3; % Calculate Profit

Sale(n1) = str2; %calculate Sale

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