数据是离散的A[s h] ,我用plot画出了二维曲线，我想在鼠标按下后，就添加一些点并添加到原来矩阵里.下面是我用已知函数做的测试可行，但到离散的我就不会了，而且也只是添加了点，并不知道怎么保存，各位大师，麻烦指点。
x = 1:0.1:2*pi;
y = sin(x);
plot(x,y);
tempA = [ x' y'];
handles.tempA = tempA;
guidata(hObject,handles);
function figure1_WindowButtonDowNFCn(hObject, eventdata, handles)
% hObject    handle to figure1 (see GCBO)
% eventdata  reserved - to be defined in a future version of matlab
% handles    structure with handles and user data (see GUIDATA)
    tempA = handles.tempA;
    currPt = get(gcf, 'CurrentPoint');
    x = currPt(1,1);
    y = currPt(1,2);
    tempA_R = tempA(1:end,1);
    n = find(tempA_R > x,1,'first');
    xx = (tempA(n-1,1) + tempA(n-2,1)) / 2;
    yy =S(find(x==xx));
    hold on;
    plot(x,y,'p');
    hold off;