a Line to plot by using handles ?

Hey Guys,

Monday Morning Question: I have got an array(1x40) holding new y-Data. Now I want to plot this data in an existing Plot. Of course i could use gca / get(...,'children') / x = get(children,'xdata') to replot, but is there anyway to add the new Data and replot by using the childrens handles ?

[Adam]

I'm not quite sure I understand which children's handles you mean.

If you keep hold of your axes handles then you don't need to use children and refind them at all, just a

hold( hAxes, 'on' )
plot( hAxes,... )

will do to be able to add new data to an existing plot.

I often have my axes embedded in my main gui so obviously they are easy to retrieve the handles of, but where I spawn a new figure I tend to store its axes (or figure handle, whichever I think more useful) on the handles structure of my GUI for retrieval.

Answer 1

[Michael Haderlein]

Of course i could use gca / get(...,'children') / x = get(children,'xdata') to replot, but is there anyway to add the new Data and replot by using the childrens handles ?

The get(...,'children') gives you the children's handles. If you haven't saved them when creating the plots, you'll need to get them this way. However, you can set the new y values by set(handle,'ydata',y).

No need to say that the dimensions must remain.

[Michael Haderlein]

Sorry, what do you want to do? You want to add plots without using the plot() function? I have no idea what this should be good for, but if you really want to do that, you could copy an existing plot and modify it:

 h=copyobj(get(gca,'children'),gca);
 set(h,'ydata',rand(size(get(h,'ydata'))))

(in this example, of course, I only had one plot existing before - otherwise that setting would fail as get(h,'ydata') would return a cell)

[Max Müller]

My 1st Program Plots my 9 subplots with an unknown amount Plotines. Now I am creating a Program to get all the yValue, calculate the mean and plot the mean as a new line into the old axes of the subplot.

Answer 2

[Max Müller]

Still dont get it. I want to add a new PlotLine without using the Plot command. So i guess i need to create a new handle in the children structure cause every children is already holding its y-Value.

[Max Müller]

u cant set the axes cause the 'ydata' property is located in the every children handles structure. Now the Questions is: how can i create an new child with the structure of a PlotLine and then set its handle(yValue) to myYValue.

[Adam]

Why don't you want to call plot? It is the function you would usually use to do what you want so why try to hack something into the axes children when you can just use a function designed to do what you want?

[Max Müller]

O.K. I surrend. I will use the plot func.

[Max Müller]

no. I cant cause my PlotingProgram is far too complicated.

[Max Müller]

I need to replot the whole subplots....is it possible to replot a plot by using the plots handle ?

Answer 3

[Max Müller]

Got it. Using Plot and hold on works not perfect but....it works