Matlab Error (Z must be a matrix, not a scalar or vector.)?

P_air = .1:.1:4;
alpha = .0125:.0125:.5;
[X,Y] = meshgrid(alpha,P_air);
T_air_dry = (1/0.0408)*log((0.42*P_air.*(1-alpha))./(0.03043+(0.00714*(1-alpha))));
Z = T_air_dry;
mesh(X,Y,Z)
grid on
hold on

%I keep getting the "Z must be a matrix, not a scalar or vector" error.
%Thank you for the help

Answer 1

[KSSV]

P_air = .1:.1:4;
alpha = .0125:.0125:.5;
[alpha,P_air] = meshgrid(alpha,P_air);
T_air_dry = (1/0.0408)*log((0.42*P_air.*(1-alpha))./(0.03043+(0.00714*(1-alpha))));
Z = T_air_dry;
mesh(alpha,P_air,Z)  % use surf 
grid on
hold on