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% lab2start.m
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% 1) Create a sine (or cosine) function 2048 points long...
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figure(1)
clf
nx=2048;
kc=64/nx;
x=0:nx-1;
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%   now make the function and plot it.
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% 2) Take the fourier transform of the function from 1...
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figure(2)
clf
subplot(5,1,1),plot(x,y);
xlabel('x')
ylabel('cos(x)')
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%  generate the wavenumbers
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k=-nx/2:nx/2-1;
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cy=fftshift(fft(y));

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% 3) create a 2-D array of numbers 400 x 300 using meshgrid...
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% 
%  setup the mesh
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clear
clf
colormap('gray')
nx=300;
x=-nx/2:nx/2-1;
ny=400;
y=-ny/2:ny/2-1;
[X,Y]=meshgrid(x,y);
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%  set the horizontal wavenumber
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kc=20/nx;
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%  a sine function of x
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f=sin(4*pi*X*kc);
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