Solve Eqns

function solveEqnsBtn_Callback(hObject, eventdata, handles)
% hObject    handle to solveEqnsBtn (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
aVals = [];
bVals = [];
cVals = [];
dVals = [];
ConstVals = [];
if get(handles.checkbox1, 'Value') == 1
    aVals = [aVals; str2double(get(handles.a1, 'String'))];
    ConstVals = [ConstVals; str2double(get(handles.Const1, 'String'))];
end

if get(handles.checkbox2, 'Value') == 1
    aVals = [aVals; str2double(get(handles.a2, 'String'))];
    bVals = [bVals; str2double(get(handles.b1, 'String'))];
    bVals = [bVals; str2double(get(handles.b2, 'String'))];
    ConstVals = [ConstVals; str2double(get(handles.Const2, 'String'))];
end

if get(handles.checkbox3, 'Value') == 1
    aVals = [aVals; str2double(get(handles.a3, 'String'))];
    bVals = [bVals; str2double(get(handles.b3, 'String'))];
    cVals = [cVals; str2double(get(handles.c1, 'String'))];
    cVals = [cVals; str2double(get(handles.c2, 'String'))];
    cVals = [cVals; str2double(get(handles.c3, 'String'))];
    ConstVals = [ConstVals; str2double(get(handles.Const3, 'String'))];
end

if get(handles.checkbox4, 'Value') == 1
    aVals = [aVals; str2double(get(handles.a4, 'String'))];
    bVals = [bVals; str2double(get(handles.b4, 'String'))];
    cVals = [cVals; str2double(get(handles.c4, 'String'))];
    dVals = [dVals; str2double(get(handles.d1, 'String'))];
    dVals = [dVals; str2double(get(handles.d2, 'String'))];
    dVals = [dVals; str2double(get(handles.d3, 'String'))];
    dVals = [dVals; str2double(get(handles.d4, 'String'))];
    ConstVals = [ConstVals; str2double(get(handles.Const4, 'String'))];
end

A = [aVals bVals cVals dVals];
sol = A\ConstVals;
solStr = arrayfun(@(x) sprintf('%.2f', x), sol, 'UniformOutput', false);
while numel(solStr) < 4
    solStr{end+1} = 'N/A';  % Append 'N/A' for missing values
end

% Create the result string dynamically
resultTxt = sprintf('X1 = %s\nX2 = %s\nX3 = %s\nX4 = %s\n', solStr{:});
set(handles.text18, 'String', resultTxt)