MATLAB: Warning: Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN.

MATLABmatrix singularnearly singular

I have coding such as this:
En = length(n);         % n = number of data tottaly
Ex1= sum(x1);        % Ex1= number of Depth
Ex2= sum(x2);         % Ex2= number of Amax
Ex3= sum(x3);           % Ex3= number of Mw
Ex4= sum(x4);           % Ex4= number of Vs
Ex5= sum(x5);     % Ex5= number of Distance
x1x2= dot(x1,x2);       
x1x3= dot(x1,x3);
x1x4= dot(x1,x4);
x1x5= dot(x1,x5);
Ex1x2=sum(x1x2);
Ex1x3=sum(x1x3);
Ex1x4=sum(x1x4);
Ex1x5=sum(x1x5);
x1_2 = x1.^2;
x2_2 = x2.^2;
x3_2 = x3.^2;
x4_2 = x4.^2;
x5_2 = x5.^2;
Ex1_2 = sum(x1_2);
Ex2_2 = sum(x2_2);
Ex3_2 = sum(x3_2);
Ex4_2 = sum(x4_2);
Ex5_2 = sum(x5_2);
Ey1=sum(y1);
x1_y1=dot(x1,y1);
x2_y1=dot(x2,y1);
x3_y1=dot(x3,y1);
x4_y1=dot(x4,y1);
x5_y1=dot(x5,y1);
Ex1_y1=sum(x1_y1);                %Ex1_y = number x1 multiplyied y              
Ex2_y1=sum(x2_y1);                %Ex2_y = number of x2 multiplied by y
Ex3_y1=sum(x3_y1);
Ex4_y1=sum(x4_y1); 
Ex5_y1=sum(x5_y1);
A = [En Ex1 Ex2 Ex3 Ex4 Ex5;Ex1 Ex1_2 Ex1x2 Ex1x3 Ex1x4 Ex1x5;Ex2 Ex2_2 Ex1x2 Ex1x3 Ex1x4 Ex1x5;...
    Ex3 Ex3_2 Ex1x2 Ex1x3 Ex1x4 Ex1x5;Ex4 Ex4_2 Ex1x2 Ex1x3 Ex1x4 Ex1x5;Ex5 Ex5_2 Ex1x2 Ex1x3 Ex1x4 Ex1x5];
At = A';
G  = [Ey1;Ex1_y1;Ex2_y1;Ex3_y1;Ex4_y1;Ex5_y1];
Ai = inv(At);
I want to make an inversion task but, I got the massage like this "Warning: Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN"
Is there any one can help me to slove my probelm?
Thx

Best Answer

Yes it works now, thank you David Goodmanson
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