I am trying to adapt these equations for z being a vector. I keep on getting errors that say stuff about ".^", can someone please tell me how to correctly adapt these for z to be a vector of values??

sigmay = -pmax*((2-(1+(z .^ 2 /b^2))^-1)* sqrt(1+ (z .^ 2 /b^2))-(2 .* (z/b)))

and

sigmax = -2*v2*pmax*(sqrt(1+z .^ 2/ b^2)-(z/b))

and

sigmaz = -pmax/(sqrt(1+(z^2/b^2)))

Thanks!