Add lines to plot

Hey Guys, I have created a func. which plots me some Data. Inside my func. I use this code

Plot = figure
    set(Plot, 'Position', [306,200, 1610,1085]); 
    set(Plot,'name','Plot','numbertitle','off');

my Question is now: how can I add more Plot lines without opening a new figure ?

Answer 1

[Max Müller]

if isempty( findobj('Tag','Plot')) == 1  
    Plot = figure
        set(Plot, 'Position', [306,200, 1610,1085]); 
        set(Plot,'name','Plot','Tag','Plot','numbertitle','off'); 
else
    MakeFigureCurrent = findobj('Tag','Plot')
    figure(MakeFigureCurrent)
    hold on
end

Some day I ll be a MatLabGOD...but not in this life

Answer 2

[Azzi Abdelmalek]

Use hold on

[Andrew Reibold]

Yup, this. "hold on" and "hold off" will tell the program whether you want to add more lines (on), or add entire new figures (off).

Upvote +1

[Iain]

"hold all" might be better for you.

[Max Müller]

The problem is: hold on doesnt work as long as i have the Plot=figure command. However i need the the Plot = figure command. Otherwise, matlab displays the plot inside my GUI.

[Adam]

Plot = figure;
hAxes = gca;
hold on

plot( hAxes,... )

allows you to get the axes handle from the first new figure you open and use this to plot on next time

Answer 3

[Geoff Hayes]

Max - consider renaming your figure handle from Plot to (say) plotFigHandle or something that is a little different from the MATLAB built-in function plot.

Once you have create the figure, then try grabbing the current axes from that figure and setting the hold property to on

 plotFigureHandle = figure;
 set(plotFigureHandle, 'Position', [306,200, 1610,1085]); 
 set(plotFigureHandle,'name','Plot','numbertitle','off'); 

 plotAxesHandle = gca;
 hold(plotAxesHandle,'on');

And then you can plot multiple plot lines to the figure using the plotAxesHandle

 x=-2*pi:0.0001:2*pi;
 y=sin(x);
 plot(plotAxesHandle,x,y,'b')
 plot(plotAxesHandle,x,y+0.5,'r')

Try the above and see what happens!

[Max Müller]

my plotfnc is very complicated...this doesnt work....can u pls tell how can i plot into a specific figure (form which i know the handle)

[Max Müller]

Matlab Plots inside my Gui cause this is the last Figure i had oppend. Is there anyway i can bring the old plotarea (figure) in the for ground, so matlab plots inside this figure.

[Geoff Hayes]

Max - what you wanted to do wasn't very clear from your question which was how can I add more Plot lines without opening a new figure?

The alternative to assigning a Tag value, is to just save the plotFigureHandle and/or plotAxesHandle to the handles structure and use guidata. Presumably you are using GUIDE, and within a callback you are trying to create the figure and so one of the inputs to this callback is handles

 function someWidget_Callback(hObject, eventdata, handles)

 % if the plot figure handles is not a field of handles, then
 % create it
 if ~isfield(handles.plotFigureHandle)
     plotFigureHandle = figure;
     set(plotFigureHandle, 'Position', [306,200, 1610,1085]); 
     set(plotFigureHandle,'name','Plot','numbertitle','off'); 
     plotAxesHandle = gca;
     hold(plotAxesHandle,'on');
     handles.plotFigureHandle = plotFigureHandle;
     handles.plotAxesHandle   = plotAxesHandle;
     guidata(hObject,handles);
 end

[Adam]

If you just want to bring a previous axes handle to be the current one you can type:

axes( plotAxesHandle )

if you want to return to the same axes some time later on when you can't assume that gca points to the correct axes.

Personally I don't like doing this and prefer to pass the axes handle to the plot function as this just plots in the correct place instead of bringing the figure containing the axes to the foreground (which I don't always want) which is what the command above does.

Remember though that the plot function associates to an axes handle, not explicitly to a figure handle so just keeping the figure handle is not enough.