how to reverse the axis in matlab??

clc, clear all, close all;
fs = 400;
dt = 1/fs;
t = 0:dt:0.4;
x = sin(2*pi*50*t)';
l = length(x);
y = ceil(log2(l));
nfft = 2^y;
noverlap = 8;
figure(1)
window = 10;
spectrogram(x,window,noverlap,nfft,fs);
title('Window = 25 ms');

The above code plots a spectrogram such that Time is on Y-axis and Frequency on X-axis, I want reverse of it. How can I do that??

Answer 1

[SRI]

Hi Hemant Kindly Try this code you will get the result as you wish

fs = 400;

dt = 1/fs;

t = 0:dt:0.4;

x = sin(2*pi*50*t)';

l = length(x);

y = ceil(log2(l));

nfft = 2^y;

noverlap = 8;

figure(1)

window = 10;

[S F T P] = spectrogram(x,window,noverlap,nfft,fs);

surf(T,F,10*log10(P),'edgecolor','none');

title('Window = 25 ms');

view(0,90);

xlabel('Time (Seconds)');

ylabel('Hz');

[Hemant Nagvanshi]

time axis is on x-axis but the time are rage are not full. I mean to say spectrogram is not plotted for full time range, what about that.

Answer 2

[Hemant Nagvanshi]

spectrogram(x,window,noverlap,nfft,fs); %plots freq in x-axis by default
spectrogram(x,window,noverlap,nfft,fs,'yaxis'); %plots freq in y-axis