MATLAB: How to code data in a file onto a plotted graph

MATLABplot

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data = load('Altitude_Density.txt') ;
altitude = data(:,1) ;
density = data(:,2) ;
plot(altitude,density)

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MATLAB: Plotting wav sound file onto graph

The sound you recorded from your microphone is in stereo (by default, however you can make it single-channel monophonic if you want), so the plot is plotting both channels. The sound is stored in a (Nx2) matrix, with the left channel the first column and the right channel the second column. You can plot only one channel, or plot each in a separate figure (consider using subplot).

The sound you got from your online source is likely monophonic, and the plot displays only the one channel.

MATLAB: Plot a circle onto a 3d graph

C = [50,55, 60] ;   % center of circle 
R = 1. ;    % Radius of circle 
teta=0:0.01:2*pi ;
x=C(1)+R*cos(teta);
y=C(2)+R*sin(teta) ;
z = C(3)+zeros(size(x)) ;
patch(x,y,z,'k')
hold on
plot3(C(1),C(2),C(3),'*r')

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MATLAB: Plotting wav sound file onto graph

MATLAB: Plot a circle onto a 3d graph

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