Calculate the residual between the constraint function and the limits

For a linear constraint of the form:

lb <= A@x <= ub

the lower and upper residuals between A@x and the limits are values sl and sb such that:

lb + sl == A@x == ub - sb

When all elements of sl and sb are positive, all elements of the constraint are satisfied; a negative element in sl or sb indicates that the corresponding element of the constraint is not satisfied.

x: array_like

Vector of independent variables

sl, sbarray-like

The lower and upper residuals