Undefined function or method 'H' for input arguments of type 'double'.

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Habib
Habib 2014-11-17
评论： Habib 2014-11-17
Hi guys.
Why does the following error comes? what is wrong?
??? Undefined function or method 'H' for input arguments of type 'double'.
Error in ==> yeniyazi2FT at 45
H(j)=fftshift(H(j));
close all
clear all
clc
x_1=linspace(-1,1,5);
y_1=linspace(-1,1,5);
z=0.5;
L1=0.5;
lambda=1030e-9;
k=2*pi/lambda;
w0=0.1;
zr=pi*w0.^2/lambda;
R=z*(1+(zr/z).^2);
w=w0*sqrt(1+(z/zr)^2);
[x1,y1]=meshgrid(x_1,x_1);
u1=w0/w.*exp(-(x1.^2+y1.^2).^2/w.^2).*exp(-1i*k*z).*exp(-1i*k*(x1.^2+y1.^2).^2/(2*R));
j=sqrt(-1);
L=0.25;
[M,N]=size(u1); % get inpute field array size
dx=L/M; % sample interval
k=2*pi/lambda; %wavenumber
fx=-1/(2*dx):1/L:1/(2*dx)-1/L; %freq coords
[FX,FY]=meshgrid(fx,fx);
x2=x1; %obs coords
y2=y1;
H=exp(-1i*pi*lambda*z*(FX.^2+FY.^2)); %trans func
for j=1:5
H(j)=fftshift(H(j));
u(j)=fft2(fftshift(u(j)));
u(j+1)=H(j).*u(j);
u(j+1)=ifftshift(ifft2(u(j+1))); end

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-11-17
u is not defined.
x_1=linspace(-1,1,5);
y_1=linspace(-1,1,5);
z=0.5;
L1=0.5;
lambda=1030e-9;
k=2*pi/lambda;
w0=0.1;
zr=pi*w0.^2/lambda;
R=z*(1+(zr/z).^2);
w=w0*sqrt(1+(z/zr)^2);
[x1,y1]=meshgrid(x_1,x_1);
u1=w0/w.*exp(-(x1.^2+y1.^2).^2/w.^2).*exp(-1i*k*z).*exp(-1i*k*(x1.^2+y1.^2).^2/(2*R));
j=sqrt(-1);
L=0.25;
[M,N]=size(u1); % get inpute field array size
dx=L/M; % sample interval
k=2*pi/lambda; %wavenumber
fx=-1/(2*dx):1/L:1/(2*dx)-1/L; %freq coords
[FX,FY]=meshgrid(fx,fx);
x2=x1; %obs coords
y2=y1;
H=exp(-1i*pi*lambda*z*(FX.^2+FY.^2)); %trans func
for j=1:5
H(j)=fftshift(H(j));
u(j)=fft2(fftshift(u1(j)));
u(j+1)=H(j).*u(j);
u(j+1)=ifftshift(ifft2(u(j+1)));
end

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