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Alternative Mathematics using MATLAB 7

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Alternative Mathematics using MATLAB 7



13 Mar 2003 (Updated )

Self-instructive text on undergraduate algebra, statistics, differential and integral calculus.

% ex254c.m:  Transform of a Sine Wave Train with Noise
clear all
ns=1001;  A=1;  nu0=2.0;  a=15/nu0/2;  w0=2*pi*nu0;		
dt=2*tlim/(ns-1); 									% Time increment   
T=-tlim:dt:tlim ;         							% Sample points, input variable
randn('seed', sum(100*clock));		% Set normal distribution
F=A*cos(w0*T)+ noise;     
figure(1),  plot(T,F),  grid on, zoom on	% Show input function
   xlabel('time t'),  ylabel('function f(t)'),  axis([-tlim tlim get(gca,'Ylim')])
Nu=linspace(0, 4, 200);
G=sft(T, F, Nu);   								% Simple Fourier transform
W=2*pi*Nu;										% Angular frequency
Gex=A*( sin(a*(W+w0))./(W+w0)- sin(a*(W-w0))./(W-w0));
figure(2),  plot( Nu,real(G), Nu,imag(G),'r:'),  grid on
   xlabel('frequency'), ylabel('transform G'), legend('real', 'imaginary')
   axis([min(Nu) max(Nu) get(gca,'Ylim')])  

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