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Error using patch Vectors must be the same lengths.

Asked by Varun Kumar on 31 May 2019
Latest activity Edited by Varun Kumar on 3 Jun 2019
function popupmenu7_Callback(hObject, eventdata, handles)
% hObject handle to popupmenu7 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: contents = cellstr(get(hObject,'String')) returns popupmenu7 contents as cell array
% contents{get(hObject,'Value')} returns selected item from popupmenu7
v=get(handles.popupmenu7,'Value')
if v == 1
X1=get(handles.edit1, 'String');
X2=get(handles.edit4, 'String');
X3=get(handles.edit7, 'String');
X4=get(handles.edit10, 'String');
Z=[X1 X2 X3 X4]
elseif v == 2
Y1=get(handles.edit2, 'String');
Y2=get(handles.edit5, 'String');
Y3=get(handles.edit8, 'String');
Y4=get(handles.edit11, 'String');
Z=[Y1 Y2 Y3 Y4]
elseif v == 3
Z1=get(handles.edit3, 'String');
Z2=get(handles.edit6, 'String');
Z3=get(handles.edit9, 'String');
Z4=get(handles.edit12, 'String');
Z=[Z1 Z2 Z3 Z4]
end
image=uigetfile('*.png', 'File Selector');
imshow(image)
axes=handles.axes1;
hold on;
maxAllowablePoints = 5; % Whatever you want.
numPointsClicked = 0;
promptMessage = sprintf('Left click up to %d points.\nRight click when done.', maxAllowablePoints);
titleBarCaption = 'Continue?';
button = questdlg(promptMessage, titleBarCaption, 'Continue', 'Cancel', 'Continue');
if strcmpi(button, 'Cancel')
return;
end
while numPointsClicked < maxAllowablePoints
numPointsClicked = numPointsClicked + 1;
[x(numPointsClicked), y(numPointsClicked), button] = ginput(1)
if button == 3
% Exit loop if
break;
end
end
% Print to command window
x
y
Z
msgbox('Done collecting points');
patch(handles.axes1, x,y,Z, 'Facecolor', 'interp')
hold off
i am using this code to plot on the image but getting error as follows
Error using patch
Vectors must be the same lengths.
Error in imgplt3d>popupmenu7_Callback (line 643)
patch(handles.axes1, x,y,Z, 'Facecolor', 'interp')
Error in gui_mainfcn (line 96)
feval(varargin{:});
Error in imgplt3d (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)imgplt3d('popupmenu7_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback
please help me

  2 Comments

The error clearly says (x,y,Z) are of not same size. Check the dimensions of each.
but (x,y,Z) are of same dimension (1row, 4columns)

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2 Answers

Answer by Stephen Cobeldick on 3 Jun 2019
Edited by Stephen Cobeldick on 3 Jun 2019
 Accepted Answer

The problem is very simple: you never actually convert the string data to numeric.
Replace all of your Z definitions with this:
Z = str2double({X1,X2,X3,X4});
You will also need to pay attention that x and y have the same number of elements as Z, or otherwise have permitted sizes according to the patch documentation (your code does not do this).

  3 Comments

tahnk you Cobeldick, i have modified the code as you suggested Z is now showing properly but error appears again i dont know why, i am using 2013 matlab version
varun - your verson of MATLAB may require you to use a property name to indicate the axes. Try doing
patch(x,y,Z, 'Facecolor', 'interp', 'Parent', handles.axes1)
thank you so much it worked but one thing complete patch is having same color. i am using the 2013b version is that the reason

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Answer by Geoff Hayes
on 31 May 2019

Varun - your Z seems to be 1x4 array, but the x and y are 1x5. Your code
maxAllowablePoints = 5;
numPointsClicked = 0;
while numPointsClicked < maxAllowablePoints
numPointsClicked = numPointsClicked + 1;
[x(numPointsClicked), y(numPointsClicked), button] = ginput(1)
if button == 3
% Exit loop if
break;
end
end
Assuming that the button is never 3 (which I suppose it can) and since your numPointsClicked starts at zero, then your x and y can be (at most) of dmension 1x5. Just change maxAllowablePoints to 4 and you should be fine.

  1 Comment

still same error is appearing eventhough i changed maxAllowablePoints to 4. z is being shown as in figure below i dont know is it vector or not there is no space between elements
2019-06-03_10h16_57.png

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