matlab re-orders my equation

hi guys

so am trying to get coefficient of an eqtion in matlab but matlab keeps changing the order of terms after defining the equation or making a derivetive of it:

Phi1=C11*sin(Alpha1*X1)+C12*cos(Alpha1*X1)+C13*sinh(Alpha1*X1)+C14*cosh(Alpha1*X1);

eqn1= Phi1==0;

eqn2=diff(Phi,X1)==0;

since order of the C11, C12, C13, C14 coefficents changes in the above equation below line does not work:

coeffs(lhs(eqn1),[C11 C12 C13 C14])

and one more thing, how can I put zero insted of the coefficents which are not exist, for example if I replace X1 with zero then I want to get :

[0 1 0 1] insted of [1 1]

thanks a lot

Answer 1

[Steven Lord]

Call coeffs with two output arguments.

>> [C, T] = coeffs(lhs(eqn1), [C11 C12 C13 C14])

Answer 2

[atabak mostafavi]

thank you for your answer steven, however my problem is more related to the displaying the equation becuse matlab re-orders the equation as it wants. so how can i keep the order for example after derivative?