El dijous, 4 dâ€™octubre de 2018, a les 12:20:18 EDT, John W. Eaton va escriure:

I'm working on the spectrogram function and can't seem to get the same

plots as shown in the Matlab online documentation for this function.

Could someone run the following in a recent version of Matlab and post

the resulting sgram.mat file? This is the first example from the Matlab

online documentation for spectrogram. Also, please verify that the

figure you generate looks the same as the one there.

N = 1024;

n = 0:N-1;

w0 = 2*pi/5;

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

s = spectrogram (x);

spectrogram (x, 'yaxis');

%% For the following, I expect one image object as the

%% child of the axes object. If that's not correct, then

%% can you find the image that is plotted and get the cdata,

%% xlim, and ylim values?

h = get (gca, 'children');

cdata = get (h, 'cdata');

xlim = get (h, 'xlim');

ylim = get (h, 'ylim');

cmap = colormap ();

save sgram.mat x s cdata xlim ylim cmap

Thanks,

jwe

Please see attachment (run in Matlab 2018b)

Note that I had to replace:

xlim = get (h, 'xlim');

ylim = get (h, 'ylim');

By:

xlim = get (gco, 'xlim');

ylim = get (gco, 'ylim');

To avoid errors:

Error using matlab.graphics.primitive.Image/get

There is no xlim property on the Image class.

Error using matlab.graphics.primitive.Image/get

There is no ylim property on the Image class.

....

a.