Plot into existing Gui figure/axes

hello, i am new at matlab and need help at the following problem:

i created a gui axes and colleceted x and y coordinates from it.

now I want to plot a dot at (x,y) into the existing axes. Like a marker where i clicked.

thats my code right now:

% --- Outputs from this function are returned to the command line.
function varargout = feld6_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
varargout{1} = handles.output;
title('sPiElFeLd');
global n % n input is in an other gui
set(gca,'XTick',(1:1:n)); 
set(gca,'YTick',(1:1:n)); 
xlim([0.5 n+0.5]) 
ylim([0.5 n+0.5]) 

% squares for field
for k= 0:1:n-1 
     for j=0:1:n-1
     rectangle('Position', [k+0.5 j+0.5 1 1])       
     end 
 end
 
% Click positions
[x,y] = ginput(1);  
x = int64(x); % x Click position 
y = int64(y); % y Click position 

[Adam Danz]

I don't see a question (or an explanation to the problem).

If you want to plot a coordinates to a specific axis, include the axis handle in the first input to the plot() function.

plot(axisHandle, x, y, 'bo')

or you could try this less-reliable method

plot(gca(), x, y, 'bo')
%    ^^^^^ get current axis handle

Using a global variable to share variables between GUIs is not recommeneded. Using global variables is nearly always avoidable and it introduces a slew of problems. Instead, if you search the internet for "matlab communicating between two GUIs" or "matlab pasing data betweeen..." or "sharing..." you'll see lots of alternative suggestions from this forum. A google search of the first phrase resulted in 11 relevant suggestions off the bat.

[erik lang]

i tried both of them and this is what happened:

1. Solution. i got the follwoing error:

Unrecognized function or variable 'axisHandle'.

Error in feld6>feld6_OutputFcn (line 99)
plot(axisHandle, x, y, 'bo')

2. Solution: the dot is plotted, but the squares i created are gone :/

ps.: thanks for the tip with the variables :)

[Adam Danz]

The reason you got an error with solution 1 is because I totally made up the variable name "axisHandle". I could have named it "SantaClaus". That variable should be the axis handle to the axis you're plotting on. It needs to be replaced with your variable name. Here's an example.

ax = axes(); 
plot(ax, 0,0,'bo')

See the documentation for more info: plot(ax,___)

The second problem is probably because you're not holding the axis. Check out the docmentation: hold on

[erik lang]

thanks