YDataSource problems

Hi there,

I'm trying to create an animated plot with data from four sensors. I got it to work with the data from one sensor using the refreshdata command. However, refreshdata didn't like plotting more than one column of data. I was hoping that the following code would work, but I get the error:

??? Error using ==> set Invalid handle object.

Error in ==> guiTest>pushbutton_Play_Callback at 450 set(h1,'YDataSource','handles.y1')

What am I doing wrong... and maybe more to the point... what's the best way to plot multiple lines in the same graph and then update it many times/sec?

A snippet of code is below. Thanks!

    handles.y1 = rawData(handles.x,1);
    handles.y2 = rawData(handles.x,2);
    handles.y3 = rawData(handles.x,3);
    handles.y4 = rawData(handles.x,4);
    h1 = plot(handles.data,handles.x,handles.y1);
    h2 = plot(handles.data,handles.x,handles.y2);
    h3 = plot(handles.data,handles.x,handles.y3);
    h4 = plot(handles.data,handles.x,handles.y4);
    set(h1,'YDataSource','handles.y1')
    set(h1,'XDataSource','handles.x')
    set(h2,'YDataSource','handles.y2')
    set(h2,'XDataSource','handles.x')
    set(h3,'YDataSource','handles.y3')
    set(h3,'XDataSource','handles.x')
    set(h4,'YDataSource','handles.y4')
    set(h4,'XDataSource','handles.x')

Answer 1

[Paulo Silva]

Use lines instead of plots and change their xdata and ydata everytime you want to update them.

I can't understand that code, you are changing the datasource for what purpose?

[Ethan]

After the code I posted above, I have a while loop that goes through and changes the "window."

My while loop is increasing the value of 'k', and handles.x = k:k-window

Then I update handles.x and handles.y1 through handles.y4 and refreshdata.

This works fine:

handles.y = rawData(handles.x,1);

h = plot(handles.data,handles.x,handles.y);

set(h,'YDataSource','handles.y')

set(h,'XDataSource','handles.x')

while (k < (theEnd + 1))

handles.x1 = k

handles.x2 = handles.x1 - window;

handles.x = handles.x2:handles.x1;

handles.y = rawD(handles.x,1);

refreshdata(handles.data,'caller')

k = k+1;

end

I WISH this worked, but it doesn't:

handles.y = rawData(handles.x,1:4);

h = plot(handles.data,handles.x,handles.y);

set(h,'YDataSource','handles.y')

set(h,'XDataSource','handles.x')

while (k < (theEnd + 1))

handles.x1 = k

handles.x2 = handles.x1 - window;

handles.x = handles.x2:handles.x1;

handles.y = rawD(handles.x,1:4);

refreshdata(handles.data,'caller')

k = k+1;

end

This is what I'm currently trying to do, but it doesn't work either:

handles.y1 = rawData(handles.x,1);

handles.y2 = rawData(handles.x,2);

handles.y3 = rawData(handles.x,3);

handles.y4 = rawData(handles.x,4);

h1 = plot(handles.data,handles.x,handles.y1);

h2 = plot(handles.data,handles.x,handles.y2);

h3 = plot(handles.data,handles.x,handles.y3);

h4 = plot(handles.data,handles.x,handles.y4);

set(h1,'YDataSource','handles.y1')

set(h1,'XDataSource','handles.x')

set(h2,'YDataSource','handles.y2')

set(h2,'XDataSource','handles.x')

set(h3,'YDataSource','handles.y3')

set(h3,'XDataSource','handles.x')

set(h4,'YDataSource','handles.y4')

set(h4,'XDataSource','handles.x')

while (k < (theEnd + 1))

handles.x1 = k

handles.x2 = handles.x1 - window;

handles.x = handles.x2:handles.x1;

handles.y1 = rawDImport(handles.x,1);

handles.y2 = rawDImport(handles.x,2);

handles.y3 = rawDImport(handles.x,3);

handles.y4 = rawDImport(handles.x,4);

refreshdata(handles.data,'caller')

k = k+1;

end