MATLAB error 'index exceeds matrix dimensions'

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ali 2016-2-4

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https://ww2.mathworks.cn/matlabcentral/answers/266694-matlab-error-index-exceeds-matrix-dimensions

关闭： MATLAB Answer Bot 2021-8-20

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hello all

i want to run this function but i got index exceeds, i checked my loops but i could not saw the error.

where vn=vs=1 and M=100 and th1=1000 and Dr1=D1=0

function D=distortion(vn,vs,M,th1,x,y,Dr1,D1);
for i=1:M;
    for j=1:M;
        if i~=j 
 d1(i,j)=sqrt(((y(j)-y(i))^2+(x(j)-x(i))^2));
Dr1=exp(-d1(i,j)/th1)+Dr1;
        end 
    end
end
for i=1:M
    ds1(i)=sqrt(((y(j)-0)^2+(x(j)-0)^2));% point source at 0 0
cor2=exp(-ds1(i)/th1);
D1=cor2+D1;
end
 D=(vs^2)-((vs^4)/(M*((vs^2)+(vn^2))))*(2*(D1-1))+((vs^6)/((M^2)*((vs^2)+(vn^2)))*Dr1);
end

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Image Analyst 2016-2-4

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This worked for me.

function test1
vn=1
vs=1 ;
M=100 ;
th1=1000;
Dr1=0;
D1=0
y = rand(1,M);
x = rand(1,M);
D=distortion(vn,vs,M,th1,x,y,Dr1,D1)
end
function D=distortion(vn,vs,M,th1,x,y,Dr1,D1)
for i=1:M;
  for j=1:M;
    if i~=j
      d1(i,j)=sqrt(((y(j)-y(i))^2+(x(j)-x(i))^2));
      
      Dr1=exp(-d1(i,j)/th1)+Dr1;
    end
  end
end
for i=1:M
  ds1(i)=sqrt(((y(j)-0)^2+(x(j)-0)^2));% point source at 0 0
  cor2=exp(-ds1(i)/th1);
  D1=cor2+D1;
end
D=(vs^2)-((vs^4)/(M*((vs^2)+(vn^2))))*(2*(D1-1))+((vs^6)/((M^2)*((vs^2)+(vn^2)))*Dr1);
end