problem with multiplying a matrix with a vector

Hi Matlab Community,

i have a problem with my matlab script. M is a matrix and R is a vector. i cant see the problem right now. also in the workspace there is a NaN shown for C. Hope you can help me.

[Stephen23]

"problem with multiplying a matrix with a vector"

The problem is that you are trying to create the inverse of a (nearly) singular matrix:

[0,0;0,1]^(-1)

Warning: Matrix is singular to working precision.

ans = 2×2

Inf Inf Inf Inf

●

In any case, solving for C using the matrix inverse is not recommended, the more efficient and more accurate method is to use mldivide, exactly as the inv documentation explains:

SOL.C = SOL.M\SOL.R

Of course that will not get rid of your singular matrix, so you will still need to fix that.

[Ömer Altas]

oh ok thanks. i have not seen that