Retrieveing and replacing data in a plot

Hi Everyone,

I've created a GUI which plots multiple sets of data [x column of data is constant whilst there are multiple y columns of data]. Once the figure is open, a button appears which allows the user to filter the data [using butter and filtfilt]. As I've programmed it to filter again by a certain factor with every click, it's important that the process can occur more than once.

As this is part of a very complicated GUI, I don't want to overwrite the original plot by using another plot() function. What I would ideally like to do is after I have retrieved the data using

YData = get(gcf,'YData')

and changed it, I'd like to replace it by saying

set(gcf,'YData',YData)

This works fine when I have only one set of YData on the graph, but is there a way I can implement this with multiple vectors? Every time I attempt this I recieve the anticipated error that it cannot plot from cell array as there are multiple columns of y-axis data.

Thanks,

Rosie

Answer 1

[Matt Fig]

I'm a little confused. There is no ydata property for figures. Did you mask the GCF function with the line object's handles?

Any way, try this:

% First plot the data:
x = 1:10;
L = plot(x,x.^2,x,x.^2.2);  % Return handles to lines.
pause; % Look at the plot, the press return...
ydata = get(L,'ydata');
ydata{1} = sqrt(ydata{1});  % Alter the first cell.
set(L,{'ydata'},ydata)  % Reset the data.

[Rosie]

Thanks so much, Matt.

Turns out the only thing missing were the curly brackets around 'YData' - amateur mistake =\

Thanks again

Answer 2

[Azzi Abdelmalek]

maby you should convert your data from cell to mat

ydata=cell2mat(ydata)

[Rosie]

Thanks for the quick response.

I tried this before. Unfortunately it seems to want only a single vector of ydata. What bothers me is that I recieved it in 2 cells of data, so why can't I put it back in the form of 2 cells of data?

Or is there some way I can trick it into putting it back?