plotting multiple variables in a listbox

Good Morning, I am trying to plot all variables selected in a listbox in a matlab gui. I seem to be overwriting the variables when plotting and only plotting the last one even when using the hold on command inside the loop. I also cannot figure out how to add a legend to the plot which corresponds to the variable selected in the listbox.

Any suggestions?

Thanks so much.

%Setting up string and value for desired parameters
Variable_Name = get(handles.Parameter_Listbox,'String');
Index = get(handles.Parameter_Listbox,'Value');

%Setting results plot
axes(handles.Plot)

%Creating loop for parameters choosen
for i=1:length(Index)
    Parameter(:,i)=Data(:,Index(i))
end
[j,k]=size(Parameter);
for p=1:k
    plot(Data(:,2),Parameter(:,k));
    hold on
    legend(Variable_Name(k));
    hold on
end

Answer 1

[Jan]

You are plotting Data(:, 2) against Data(:, Index). Is this your intention?

What about this:

Variable_Name = get(handles.Parameter_Listbox,'String');
Index = get(handles.Parameter_Listbox,'Value');

plot(Data(:,2), Data(:, index).', 'Parent', handles.Plot);
legend(Variable_Name(index));

[Melissa]

AMAZING! thank you!

[Melissa]

Wait now its saying my legend matrix is empty...

[Jan]

Please post a complete copy of the error message.

[Melissa]

Using your same logic I found a way so that the matrix was not empty:

pHandles = plot(Data(:,2), Data(:, Index).', 'Parent', handles.Plot);
legend(pHandles,Variable_Name(Index));

Thanks for all of your help.

Answer 2

[Michael Haderlein]

You only plot the last Parameter, you need to change the line

plot(Data(:,2),Parameter(:,k));

to

plot(Data(:,2),Parameter(:,p));

The same with the legend, too.

[Melissa]

Thanks!! It worked great for the Parameter plotting but not for the legend when changing to p. Any idea why?

[Michael Haderlein]

Sorry, my comment on the legend was wrong. You overwrite the legend in every iteration. Put the legend command below the loop and write

legend(Variable_Name(Index))

[Michael Haderlein]

Anyway, Jan Simon's answer is better as he plots everything without the loop - just follow his answer.