Have a problem about code

I'm new in matlab and I have a problem below

Cs=[0.15:0.15:0.45];
Cx=0.12;
C0= 0.08;
Erf=(Cs-Cx)/(Cs-C0)

Why Erf answer have only 1 answer, it should have 9 answers?

[DGM]

Why would it have 9 elements? If you use elementwise division instead of matrix division, it'll have 3.

Cs = 0.15:0.15:0.45;
Cx = 0.12;
C0 = 0.08;
Erf = (Cs-Cx)./(Cs-C0)

Erf = 1×3

0.4286 0.8182 0.8919

If you transpose one of the vectors, you can get 9, but I don't know if that's intended.

Erf = (Cs-Cx)./(Cs.'-C0)

Erf = 3×3

0.4286 2.5714 4.7143 0.1364 0.8182 1.5000 0.0811 0.4865 0.8919

[Ratchapon Nilprapa]

Thank you for your advise, DGM.