How to detect the uitable on GUI

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han han
han han 2020-7-4
回答： Image Analyst 2020-7-4
I wnat to detect whether the uitable on the GUI is empty.
but it shows "Input #2 expected to be a cell array, was double instead."
If I change the data format to cell, it will not be able to enter "all(cellfun(@isempty, data(:)))"
data = get(handles.uitable1);
if all(cellfun(@isempty, data(:)))
errordlg('uitable is empty','warning');
else
disp('not empty');
end
how modifity it?
  2 个评论
Mehmed Saad
Mehmed Saad 2020-7-4
this error is occuring in someother line of code. can you share the complete code?
han han
han han 2020-7-4
编辑：han han 2020-7-4
sure
function varargout = u11ntitled(varargin)
gui_Singleton = 1;
gui_State = struct('gui_Name', mfilename, ...
'gui_Singleton', gui_Singleton, ...
'gui_OpeningFcn', @u11ntitled_OpeningFcn, ...
'gui_OutputFcn', @u11ntitled_OutputFcn, ...
'gui_LayoutFcn', [] , ...
'gui_Callback', []);
if nargin && ischar(varargin{1})
gui_State.gui_Callback = str2func(varargin{1});
end
if nargout
[varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT
% --- Executes just before u11ntitled is made visible.
function u11ntitled_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject handle to figure
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% varargin command line arguments to u11ntitled (see VARARGIN)
% Choose default command line output for u11ntitled
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes u11ntitled wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = u11ntitled_OutputFcn(hObject, eventdata, handles)
varargout{1} = handles.output;
% --- Executes on button press in next.
function next_Callback(hObject, eventdata, handles)
set(handles.uipanel2,'Visible','on') %go to uipanel1
data = get(handles.uitable1);
if all(cellfun(@isempty, data(:)))
errordlg('uitable is empty','warning');
else
disp('not empty');
end
% --- Executes on button press in back.
function back_Callback(hObject, eventdata, handles)
set(handles.uipanel2,'Visible','off') %back to uipanel1
% --- Executes on button press in show.
function show_Callback(hObject, eventdata, handles)
[BSLocation] = textread('Convert\BSLocation.txt','','headerlines', 1);
BSX = num2str(BSLocation(:,1));
BSX = cellstr(BSX);
BSY = num2str(BSLocation(:,2));
BSY = cellstr(BSY);
BSZ = num2str(BSLocation(:,3));
BSZ = cellstr(BSZ);
set(handles.Uitable1,'Data',[BSX BSY BSZ]);

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回答（2 个）

Mehmed Saad
Mehmed Saad 2020-7-4
all(cellfun(@isempty, data(:)))
error is in this line. data(:) is a double array on which you are trying to apply cellfun
also you have uitable1 and Uitable1 which are seperate variables (means two seperate table).
If uitable1 is a table this should be your command
data = get(handles.uitable1,'Data');
and now the data is not a cellarray so cellfun is not required
you can apply isempty directly
For example
t = readtable('patients.xls');
vars = {'Age','Systolic','Diastolic','Smoker'};
t1 = t(1:0,vars);
fig = uifigure;
uit = uitable(fig,'Data',t1);
Now check if it is empty
if(isempty(uit.Data))
t2 = t{1:4,vars};
uit.Data = t2;
end
Image Analyst
Image Analyst 2020-7-4
You can use isempty() to determine if a variable is null.
You can use iscell() to determine if a variable is a cell array.
There is a function called isa() that lets you check whether a variable is of a specified class, like double, uint8, cell, etc.

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