how to use if option

Cs=[0.15:0.15:0.45];

Cx=0.12;

C0= 0;

%Erf=(Cs-Cx)/(Cs-C0);

Erf=[0.2 0.6 0.7333]

if Erf > 0 && Erf <=2

z=(-0.3725*(Erf^2))+(1.2144*(Erf))+(0.0006)

else if Erf >2

z=(-0.0109*((Erf)^2))+(0.0577*(Erf))+(0.9235)

end

%Erf formula above pls help to make it calculate and get 3 answer, i try many time still got only 0.6571 only 1 answer (Cs = 0.15 0.30 0.45)

and about if option

I want to use answer from above and let them choose formula, condition if ans<2 use first z formula, if ans>2 use second formula

I cant run with my code please help!

first formula z = -0.3725x^2+ 1.2144x + 0.0006

second z = -0.0109x^2 + 0.0577x + 0.9235

Answer 1

[Cris LaPierre]

See Ch 13 (Programming) of MATLAB Onramp