How can I plot data in a existing figure?

Hi All,

I am trying to add some data to an existing figure that I load in my script. A simplified example:

    Test = open('Test.fig');
    figure(Test)
    hold on
    A = 1:1:100
    B = 0:0.02:1.98
    plot(A,B)

However, this doesn't give the expected results as it overwrites the opened figure. Removing the 'hold on' makes the opened figure remain active but the line is not added and is nowhere to be found. I have been playing with hgload and copyobj as well but I didn't get it to work.

Any suggestions?

Thanks, Mark

[Thomas]

Do you want to see two figures?

[Mark]

No, I would like to load an existing figure and add more lines (data) to it. The result is one figure: the original with some extra lines.

Thanks

[Thomas]

That is exactly what your code does. Are you sure you are not overwriting the same exact plot and so you can not see it try..

 Test = open('Test.fig');
    figure(Test)
     pause(2)  %pause for you to see that it is bringing ur fig up
    hold on
    A = 1:1:100
    B = 0:0.02:1.98
    plot(A,B,'*','color','r')

[Mark]

Yes, it is overwriting so the hold on does not do what it is supposed to do which is what I don't get. Any idea?

[Thomas]

if it is the same exact plot it will overwrite and you wont even know it. Did you try what I put in my previous reply

[Mark]

Yes I did, so what happens is; first the opened figure appears but that one is consequently overwritten by the plot command. This while I would expect it to hold on to it.

Thanks, your help is appreciated.

[Thomas]

I dont think you understand.. its not overwriting.. its covering it with the new plot( since you are plotting the same identical thing) If you plot something else it will show two different line on the same figure as

 Test = open('Test.fig');
    figure(Test)
     pause(2)  %pause for you to see that it is bringing ur fig up
    hold on
    A = 1:1:100
    B = 0:0.01:0.99
    plot(A,B,'*','color','r')

[Mark]

Thanks, I think I get what you are saying but how can I solve this issue? As I mentioned I basically want to paste some extra lines into an existing figure (with totally different lines).

Answer 1

[Image Analyst]

I'm not sure what comes back when you save a figure as a .fig format file and then recall it. I'd save the data into a .mat file instead and then re-create your figure, after reading in the mat file, by plotting all the old data and annotations, then adding your new stuff.