You are watching: Warning: matrix is singular to working precision
The inv documentation explains that mldivide and mrdivide are faster and numerically more accurate compared to using inv and matrix multiplication.
The documentation clearly states "It is seldom necessary to form the explicit inverse of a matrix. A frequent misuse of inv arises when solving the system of linear equations Ax = b. One way to solve the equation is with x = inv(A)*b. A better way, from the standpoint of both execution time and numerical accuracy, is to use the matrix backslash operator x = A. This produces the solution using Gaussian elimination, without explicitly forming the inverse. See mldivide for further information."
The warning "Matrix is singular to working precision" occurs if the matrix for which you are trying to calculate the inverse is singular and hence the inverse does not exist.
From your MATLAB script, line 30, I can see that the value of "C*inv(A - B*K)*B" is zero, and hence if you try to calculate inverse for it, you will get that warning message.
Can anyone guide me how to resolve the issue? In case below code is not readable, please see the attachments.
% f = Total Cost and the retention time and number of screens are represented by x(1)and x(2), respectively;
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