%-- 10/15/08  3:10 PM --%
x = [1:0:100]
x = [1:0.1:100]
x = [1:0.1:100];
y = rand(1000);
plot(x,y)
length(y)
length(x)
x = [0:0.1:100];
length(x)
x = [0.1:0.1:100];
length(x)
plot(x,y)
plot(x,y, '.')
y = x
plot(x,y)
fft(y, x)
fft = fft(y, x)
plot(fft)
fft = fft(y, 100)
Y = fft(y, 512)
y
Y = fft(y, 512);
Y = fft(y, 32);
Y = fft(y, 64);
randn('state',0)
t = 0:0.001:0.6;
x = sin(2*pi*50*t) + sin(2*pi*120*t);
y = x + 2*randn(1,length(t));
plot(y(1:50))
Y = fft(y,512);
plot(Y)
plot(Y, '.')
length(Y)
Y
plot(abs(Y))
plot(phase(Y))
plot(angle(Y))
(0:255)
plot(abs(Y))
x = linspace(0, 100, 1000)
x = linspace(0, 100, 1000);
y = sin(x)/x;
plot(x,y)
y
x
y = sin(x)
y = (sin(x))/x
y = (sin(x))./x
plot(x,y)
Y = fft(y,512);
plot(abs(Y))
plot(abs(Y), '.')
Y
x = linspace(-100, 100, 1000);
y = (sin(x))./x;
plot(x,y)
Y = fft(y,512);
Y
plot(Y, 512)
plot(abs(Y), 512)
plot(abs(Y))
plot(abs(Y), '.')
plot(x,y)
f = 1000*(0:256)/512;
plot(f,abs(Y))
length(f)
plot(f,abs(Y(1:257)))
plot(f,abs(Y(1:257)), '.')
x = linspace(-1000, 1000, 100000);
y = (sin(x))./x;
Y = fft(y,1024);
f = 1000*(0:512)/1024;
plot(f,abs(Y(1:514)), '.')
plot(f,abs(Y(1:515)), '.')
length(f)
plot(f,abs(Y(1:513)), '.')
x = linspace(-100, 100, 1000);
y = (sin(x))./x;
f = 1000*(0:256)/512;
Y = fft(y,512);
plot(f,abs(Y(1:257)), '.')
f = 1000*(0:128)/512;
plot(f,abs(Y(1:129)), '.')
f = 1000*(0:128)/256;
plot(f,abs(Y(1:129)), '.')
Y = Y - pi/2*i;
plot(angle(Y))
Y = Y + pi/2*i;
plot(angle(Y))
plot(angle(Y),'.')
YfaseDeslocada = Y + pi/2*i;
YfaseDeslocada = Y - pi/2*i;
plot(angle(YfaseDeslocada), '.')
plot(angle(Y),'.')
x
y = sin(x);
plot(x,y)
Y = fft(y,512);
plot(f,abs(Y(1:129)), '.')
plot(f,angle(Y(1:129)), '.')
y = cos(x);
Y = fft(y,512);
plot(f,angle(Y(1:129)), '.')
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