error in multiply a square wave and Fresnel function and plotting it...
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TULIKA
le 27 Fév 2015
Réponse apportée : Geoff Hayes
le 1 Mar 2015
[X,Y] = meshgrid(-2:.2:2);lambda=.000000001;z=.000010;R =X.^2;
F = exp((i.*pi.*R)./(lambda.*z));
mesh(imag(F));
l=20e-6;
w=4e-6;
Ts=1e-9;
t1=0:Ts:w;
t0=w+Ts:Ts:l-Ts;
s1=ones(size(t1));
s0=zeros(size(t0));
s=[s1 s0];
N=7; %How many repetitions of the wave
ss=repmat(s,1,N);
t=0:Ts:N*l-Ts;
plot(t,ss)
ss=imresize(F,[21 21]);
az=ss.*F;
plot(t,az)
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Geoff Hayes
le 1 Mar 2015
Tulika - why not include the error message? If I try to run the above code, I observe
Error using plot
Vectors must be the same lengths.
This is because your t is a 1x140000 array of doubles whereas az is a 21x21 array of complex numbers. Since they are of different dimensions, then the error message makes sense.
Step through the code to observe the same, and consider what is happening at each line and whether it makes sense.
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