How to hide text in axes?

How to hide text in axes.

This is my code,and it doesn't hide the a1 in checkbox.

I want to change the state of the text through the checkbox, but obviously it can't do it. What should i do?

function checkbox3_Callback(hObject, eventdata, handles)
   [Nodelocation] = textread('observe/mdNodeLocationXY_axisforGUI2.txt');
    WISETEST = fopen('observe/mdNodeLocationXY_axisforGUI2.txt', 'rt');
    out = textscan(WISETEST, '%s', 'Delimiter',{' '});
checkbox3_value = get(handles.checkbox3, 'Value');
    ab = out{1}(1:end);
    a1= length(str2double(ab))/6;
     a = [0:a1-1]';
     b = num2str(a); c = cellstr(b);
     a1 = text(Nodelocation(:,2), Nodelocation(:,3), c);
if checkbox3_value == 1
    set(a1, 'Visible', 'on')
elseif checkbox3_value == 0
    set(a1, 'Visible', 'off')
end

[Ahmed Anas]

Please get checkbox value by trying this, hope it will provide you the required results. Otherwise send me the error.

checkbox3_value=get(hObject,'Value')

[han han]

This way nothing has changed :(

[Ahmed Anas]

It is showing you the text or not? you are getting errors while hiding this, am i right?