Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 1.699518e-25.

my programm is actually just a simple backlash problem.

Vlmin = [0.0756;0.102;0.1404;0.1848;ect]                                              
p_in = [50.855994816125985;56.758823881954406;64.706344253059480;72.994646508377330; ect]
b = (deltap-deltap_lambda-deltap_zetaT)*(2/dichte);
A = zeros(m,4);
for i = 1:m
    A(i,1) = (V(i)/A2)^2;
    A(i,2) = (V(i)/A1)^2;
    A(i,3) = (V(i)/A3)^2;
    A(i,4) = (V(i)/A5)^2;
end   
C = A.'*A;
D = A.'*b;
x = C\D; 

When I run it , I get the notification "Matrix is close to singular or badly scaled. Results may be inaccurate. RCOND = 1.699518e-25.". do you know how I can solve this issue..

I m welcomed to every idea

Answer 1

[Matt J]

If C is singular, then C is singular and that's all there is to it. However, this will make the same inversion slightly less singular:

C=A;
D=b;
x=C\D

[Andrea Jacob]

danke