Using set to update graphs in matlab

I'm trying to update new values to a function using the 'set' function.

Here is the code:

daq_object = analoginput('winsound');
chan = addchannel(daq_object,1);
x=[10];开发者_如何学运维
num_samples = 1000;
axes(handles.axes1);
plot_handle=surf(T,F,10*log10(P),'edgecolor','none'); 
axis tight; 
view(0,90);
xlabel('Time (Seconds)'); ylabel('Hz');

 set(daq_object,'SamplesPerTrigger',inf,'SamplesAcquiredFcnCount',num_samples,...
    'SamplesAcquiredFcn',{@update_plot,handles});

function update_plot(handles)

data = getdata(daq_object,num_samples);
[S,F,T,P] = spectrogram(data,256,250,256,1E3);

    set(plot_handle,'YData',T,F,P); % ERROR WITH THIS, UPDATING THE VARIABLES. 

end

The error is that, I don't know how to update multiple variables in a function. for one variable ex:

h=plot(zeros(100,2));
for i=1:20
    set(h,'Ydata',rand(10,1));
    drawnow;
end

but here I need to update the T,F and P values. How can I use SET to do that?

I tried:

set(plot_handle,'YData',T,F,P);

but thats just giving me errors.

set takes name-value pairs, that is, after the first variable (which is a handle to a figure or some axes), the arguments need to alternate name of variable, then value to assign to that variable.

In your example that failed you have three consecutive values (T, F and P) without names in between.