How can be the variable of one slider be independent on variable of another slider , initially ?

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yogesh jain
yogesh jain 2016-2-15
评论： yogesh jain 2016-2-16
Hello all, I am using two sliders for generating cylinder (for altering R and H).code is -
function slider1_Callback(hObject, eventdata, handles)
global a; global b;
a=get(hObject,'Value');
[xc,yc,zc] = cylinder(a);
zc(2,:)=b;
axes(handles.cylinder);
axis equal;
surf(zc,xc,yc,'Facecolor',[1 1 1]);
function slider2_Callback(hObject, eventdata, handles)
global b; global a;
b=get(hObject,'Value');
[xc,yc,zc] = cylinder(a);
zc(2,:)=b;
axes(handles.cylinder);
axis equal;
surf(zc,xc,yc,'Facecolor',[1 1 1]);
when I slide first slider it gives error because initially second slider does not have any value ('b' is undefined). So when I change value of 2nd slider then 1st slider then it generates cylinder . How could I make 1st slider independent of b initially ? means when I slide first slider in the beginning it should response , should not give the error. Thank you .

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采纳的回答

Walter Roberson
Walter Roberson 2016-2-15
Before
zc(2,:)=b;
add
if isempty(b)
b = get(handles.slider2, 'Value');
end

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