MathNet Raise Scalar by a Matrix

Question

I\'m attempting to implement Logistic regression in .net using MathNumerics Linear Algebra libraries. I need to implement the following equation and am unsure of how to acc

Answer 1

let sigmoid (z : Matrix<double>) : Matrix<double> =
        z.Map (fun x -> 1.0 / (1.0 + exp (0.0 - x)))