hslider=findobj('Tag', 'xText') returns 0x0 empty GraphicsPlaceholder array.

>> SliderTool
>> hslider=findobj('Tag', 'xText')
hslider = 
  0x0 empty GraphicsPlaceholder array.
>>

Why is this application giving this error?

Answer 1

[Walter Roberson]

hslider = findobj(0, 'Tag', 'xText')

[Ba Ba Black Sheep!]

what is the explanation?

[Ba Ba Black Sheep!]

still, doesn't work.

[Walter Roberson]

all_tag_objects = findall(0, '-property', 'tag');
all_tags = get(all_tag_objects, 'tag');
[tf, idx] = ismember('xText', all_tags);
if tf
  fprintf('tag was found, object was\n');
  all_tag_objects(idx)
else
  fprintf('tag not found. Complete list of tags is:\n');
  unique(all_tags)
  fprintf('\n');
  x_tag_names_cell = regexp(all_tags, '^x', 'match');
  mask = ~cellfun(@isempty, x_tag_names_cell);
  x_tag_names_cell = x_tag_names_cell(mask);
  if isempty(x_tag_names_cell)
    fprintf('No tags beginning with "x" were found\n');
  else
    fprintf('Tags beginning with "x" are:\n');
    x_tag_names_char = char(x_tag_names_cell);
    disp(x_tag_names_char)
    fprintf('\nThe decimal equivalent of which is:\n')
    disp(0 + x_tag_names_char)
  end
end

[Walter Roberson]

If you attach the .fig file, I will investigate.

Answer 2

[Image Analyst]

Why not just say

hSlider = handles.xText;

that is, if you even need to use it at all, which you probably don't. You can get strings like this:

editBoxContents = handles.xText.String;

You can set strings like this:

handles.xText.String = 'Enter an x value here';

[Ba Ba Black Sheep!]

I am trying to learn findobj().