indices on the right incompatible

% am trying to run this my program with the function script and the input
% data given below. please have a look to know what am doing wrong
%%

function[PB,Ybub]=PB_VLE_NRTL(x,C,T,BIP)
% this is a function that calculates the bubble point using the wilson
% activity coeefficient model.
c=length(x);
for i=1:c
    Psi=exp((C(i,1))+(C(i,2)/T)+(C(i,3)*log(T))+(C(i,4)*T^C(i,5)));
    [gamma,~]=ACTIVITY_NRTL(BIP,alpha,T,x);
    PB=sum(Psi.*x*gamma);
    Ybub=Psi.*gamma/PB;
end



%% problem 2 
% in order to determine the state of aggregation of the system
T=353.15;
P=101325;
i=1:2;
x=[0.5 0.5];

BIP=[196.250  386.133];
C(i)=[88.134  -8498.6 -9.0766 8.330e18  6];
C(i)=[153.23  -10055  -19.488  1.6426e5 2];

[Alex Mcaulley]

Please, show the complete error text

[Chinaemerem Valentine Nwobi]

Not enough input arguments.

and i have all it needs to run

[madhan ravi]

Probably you’re not aware of how to call a function.

Google : How to a call a function? MATLAB