Matlab app designer spectrogram

Hello, i need help with my spectrogram in my matlab app. I got one file that i read from audioread and i don't know how to proper create a spectrogram plot. Here is my code, and some notes: Fs=48000, lenght is about 400000+ for app.y.

[app.y,app.Fs]=audioread(app.Plik);

windows=hamming(512);

noverlap=256;

nfft=1024;

sp=spectrogram(app.y(:,1),window,noverlap,nfft,app.Fs,'yaxis')

plot(app.UIAxes3,sp)

can anyone explain me how to make proper values for every option? After this code the program is creating something like this attached to post. Where's the problem?

Answer 1

[Kevin Holly]

N = 1024;
n = 0:N-1;

w0 = 2*pi/5;
x = sin(w0*n)+10*sin(2*w0*n);

Executing the spectrogram function with an output does not create a spectrogram.

s = spectrogram(x);

Running the function without the output opens up a figure window with a spectrogram.

spectrogram(x)

If you want this spectrogram to appear in your app, you could place it in a panel and the created figure window as such:

fig = figure;
spectrogram(x,'yaxis')

h = gca;
h.Parent = app.Panel;
delete(fig)

For an example, please see the app attached.

[Jakub Tkaczyk]

so with my value specified in this example this woould work like this?

i want to try this in next minutes

[Jakub Tkaczyk]

it's opening me a Windows DEsigner which i dont understand what is going on