code is giving an empty matrix

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Naema 2014-3-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/121549-code-is-giving-an-empty-matrix

关闭： MATLAB Answer Bot 2021-8-20

Hi: I am having an empty figure as the result, can anyone see what is the problem?. thanks,

here is the code//////////////// clear all; close all; clc; x=-120:1:120-1; y=-120:1:120-1; [X,Y]=meshgrid(x,y); rf=(2250/2); aaa = (-120:1:120); bbb = (-120:1:120); % for xx=linspace(-120,120,240); a=1; for xx=-120:1:120; b=1; for yy=-120:1:120;

% for yy=linspace(-120,120,240); C=zeros(length(X),length(Y)); Eyspp=dlmread('jamal_6_2.txt');

Eyfib=exp((-(X-xx).^2-(Y-yy).^2)/rf^2); % fib=Eyfib(b:b+xx-1,a:a+yy-1); fn_int=Eyfib.*conj(Eyfib); % Norma = sum(sum(Eyspp.*conj(Eyspp)))*sum(sum(Eyspp.*conj(Eyspp))); % C(a,b)=sum(sum(fn_int)./sqrt(Norma)); C(a,b)=sum(sum(fn_int)); b=b+1; end a=a+1; end figure(1); imagesc(aaa,bbb,abs(C));title('overalp');xlabel('um') axis square; grid on;

# Item one # Item two

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Answer 1

Naema 2014-3-14

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the code is organized here, is there anyone who could help me figure out what is wrong with the code? thanks, Naema

clear all;
close all;
clc;
x=-120:1:120-1;
y=-120:1:120-1;
[X,Y]=meshgrid(x,y);
rf=(2250/2);
aaa = (-120:1:120);
bbb = (-120:1:120);
%  for xx=linspace(-120,120,240);
a=1;
for xx=-120:1:120;
    b=1;
    for yy=-120:1:120;
          % for yy=linspace(-120,120,240);
          C=zeros(length(X),length(Y));
          Eyspp=dlmread('jamal_6_2.txt');
          Eyfib=exp((-(X-xx).^2-(Y-yy).^2)/rf^2);
          % fib=Eyfib(b:b+xx-1,a:a+yy-1);
          fn_int=Eyfib.*conj(Eyfib);
          % Norma = sum(sum(Eyspp.*conj(Eyspp)))*sum(sum(Eyspp.*conj(Eyspp)));
          %  C(a,b)=sum(sum(fn_int)./sqrt(Norma));
          C(a,b)=sum(sum(fn_int));
          b=b+1;
      end
      a=a+1;
  end
  figure(1);
  imagesc(aaa,bbb,abs(C));title('overalp');xlabel('um')
  axis square; grid on;